CriticalCVE-2026-76418

    Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: Unchecked Return Value to NULL Pointer Dereference (CVE-2026-76418)

    Published Last modified In CISA KEV since Sources: BSI

    What is affected, what to do

    A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group.

    The vulnerability is being actively exploited; treat it as a priority. Update secure_firewall_threat_defense to version 10.0.3, ASA (Adaptive Security Appliance) to version 9.16.4.104, Secure Firewall Threat Defense to version 10.0.3. Immediate actions, mitigation and detection rules are in the runbook below.

    Affected
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.1..9.16.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.1.28..9.16.1.28
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2..9.16.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2.3..9.16.2.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2.7..9.16.2.7
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2.11..9.16.2.11
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2.13..9.16.2.13
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.2.14..9.16.2.14
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3.3..9.16.3.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3..9.16.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3.14..9.16.3.14
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.1..9.18.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3.15..9.16.3.15
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.1.3..9.18.1.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.2..9.18.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3.19..9.16.3.19
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.3.23..9.16.3.23
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.2.5..9.18.2.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4..9.16.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.2.7..9.18.2.7
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1..9.19.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.9..9.16.4.9
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.2.8..9.18.2.8
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.14..9.16.4.14
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3..9.18.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.5..9.19.1.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.18..9.16.4.18
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.9..9.19.1.9
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3.39..9.18.3.39
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.19..9.16.4.19
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.12..9.19.1.12
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3.46..9.18.3.46
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.27..9.16.4.27
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.18..9.19.1.18
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3.53..9.18.3.53
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3.55..9.18.3.55
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.38..9.16.4.38
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.39..9.16.4.39
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.3.56..9.18.3.56
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.1..9.20.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.42..9.16.4.42
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.22..9.19.1.22
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4..9.18.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.1.5..9.20.1.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.5..9.18.4.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.24..9.19.1.24
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.48..9.16.4.48
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.8..9.18.4.8
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.2..9.20.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.27..9.19.1.27
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.55..9.16.4.55
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.22..9.18.4.22
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.2.10..9.20.2.10
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.57..9.16.4.57
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.28..9.19.1.28
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.24..9.18.4.24
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.2.21..9.20.2.21
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.61..9.16.4.61
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.31..9.19.1.31
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.29..9.18.4.29
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.2.22..9.20.2.22
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.62..9.16.4.62
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.34..9.18.4.34
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3..9.20.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.67..9.16.4.67
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.70..9.16.4.70
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.40..9.18.4.40
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1..9.23.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.1.1..9.22.1.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.71..9.16.4.71
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.4..9.20.3.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.47..9.18.4.47
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.7..9.20.3.7
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.37..9.19.1.37
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.76..9.16.4.76
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.9..9.20.3.9
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.38..9.19.1.38
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.50..9.18.4.50
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.1.3..9.22.1.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.10..9.20.3.10
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.1.2..9.22.1.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.52..9.18.4.52
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.13..9.20.3.13
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.1.6..9.22.1.6
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.53..9.18.4.53
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.82..9.16.4.82
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2..9.22.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.16..9.20.3.16
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.19.1.42..9.19.1.42
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.57..9.18.4.57
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.84..9.16.4.84
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.3..9.23.1.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.3.20..9.20.3.20
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.4..9.22.2.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.7..9.23.1.7
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4..9.20.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.9..9.22.2.9
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.13..9.23.1.13
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.7..9.20.4.7
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.13..9.22.2.13
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.66..9.18.4.66
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.10..9.20.4.10
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.19..9.23.1.19
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.85..9.16.4.85
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.14..9.22.2.14
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.67..9.18.4.67
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1..9.24.1
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.68..9.18.4.68
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.22..9.23.1.22
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.14..9.20.4.14
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.20..9.22.2.20
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.71..9.18.4.71
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.19..9.20.4.19
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.26..9.23.1.26
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.89..9.16.4.89
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.2.32..9.22.2.32
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.76..9.18.4.76
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.3..9.22.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1.5..9.24.1.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.22..9.20.4.22
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1.9..9.24.1.9
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.28..9.20.4.28
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.3.5..9.22.3.5
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.92..9.16.4.92
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.135..9.18.4.135
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.195..9.23.1.195
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.30..9.20.4.30
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1.155..9.24.1.155
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.32..9.23.1.32
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1.11..9.24.1.11
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.34..9.20.4.34
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.82..9.18.4.82
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.10..9.24.10
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.90..9.18.4.90
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.46..9.20.4.46
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.235..9.20.4.235
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.20.4.49..9.20.4.49
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.22.3.26..9.22.3.26
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.16.4.103..9.16.4.103
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.18.4.94..9.18.4.94
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.23.1.47..9.23.1.47
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software eq 9.24.1.26..9.24.1.26
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.0..7.0.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.0.1..7.0.0.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.1..7.0.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.1.1..7.0.1.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.2..7.0.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.0..7.2.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.2.1..7.0.2.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.3..7.0.3
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.0.1..7.2.0.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.4..7.0.4
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.1..7.2.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.5..7.0.5
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.3.0..7.3.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.2..7.2.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.3..7.2.3
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.3.1..7.3.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.4..7.2.4
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.6..7.0.6
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.5..7.2.5
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.4.1..7.2.4.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.3.1.1..7.3.1.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.0..7.4.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.6.1..7.0.6.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.5.1..7.2.5.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.1..7.4.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.6..7.2.6
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.6.2..7.0.6.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.1.1..7.4.1.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.7..7.2.7
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.5.2..7.2.5.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.3.1.2..7.3.1.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.8..7.2.8
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.0..7.6.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.2..7.4.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.8.1..7.2.8.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.6.3..7.0.6.3
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.2.1..7.4.2.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.9..7.2.9
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.7..7.0.7
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.7.0..7.7.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.2.2..7.4.2.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.10..7.2.10
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.1..7.6.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.2.3..7.4.2.3
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.8..7.0.8
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.2..7.6.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.7.10..7.7.10
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.7.11..7.7.11
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.8.1..7.0.8.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.2.1..7.6.2.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.7.10.1..7.7.10.1
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.2.4..7.4.2.4
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.10.2..7.2.10.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.3..7.4.3
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.4..7.6.4
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 10.0.0..10.0.0
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.4..7.4.4
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.9..7.0.9
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.11..7.2.11
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.7..7.4.7
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.4.8..7.4.8
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.2.12..7.2.12
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.6.6..7.6.6
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.7.13..7.7.13
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 10.0.2..10.0.2
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 7.0.10..7.0.10
    • Cisco Secure Firewall Threat Defense (FTD) Software eq 10.1.0..10.1.0

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    8.6

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    8.6

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: BSI

    0.6 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 47.3

    Show all metrics
    Severity
    Critical
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    190.91 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    actively exploitedSource: VulnCheck KEV (opens in a new tab), HKCERT, pwn.watch How we classify
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    8.6 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    8.6
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.6 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    47.3
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    Actively exploited
    Published
    In CISA KEV since

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    CISA assessment (SSVC)
    Exploitation: active · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 28 October 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-690

    Response and mitigation

    Why act now?

    Prioritisation rationale

    This is a network-reachable flaw that needs no authentication or user interaction and sits on a perimeter device. Its impact is availability-only, but the changed scope means the entire appliance reloads, not just the VPN service. Cisco edge VPN gateways are attractive targets because a cheap, repeatable crash disrupts both remote access and perimeter enforcement for a whole organisation. Repeated reloads can also mask other activity or expose weak failover designs. CISA does not flag ransomware use. For KRITIS and NIS2 entities running internet-facing SSL VPN with secondary authentication, treat remediation as critical within 24-72 h. Without Remote Access VPN enabled, or without secondary authentication configured, handling it in the regular patch cycle is defensible.

    1. Runbook step 1

      Immediate response (0-24 h)

      • Inventory exposure: Identify every ASA and FTD instance running Remote Access SSL VPN (Cisco Secure Client/AnyConnect, TCP 443 plus DTLS on UDP 443). Run show version to check the release. Affected per context: ASA 9.16.1, 9.16.1.28, 9.16.2, 9.16.2.3, 9.16.2.7, 9.16.2.11, 9.16.2.13 and 9.16.2.14. FTD is also affected according to the description; check the Cisco Security Advisory for the exact FTD releases.
      • Find the triggering configuration: Exploitation requires secondary authentication on a tunnel group. Locate it with show running-config tunnel-group | include secondary-authentication-server-group. Internet-facing boxes with this setting go to the top of the queue.
      • Patch: A patch is available from the vendor; look up the fixed version in the vendor advisory. Use the Cisco Software Checker to determine the first fixed release for your 9.16.x or FTD train. For Active/Standby pairs, upgrade the standby unit first, then fail over.
      • Preserve crash evidence before rebooting: Collect show crashinfo and show tech-support (for FTD, a troubleshoot file via FMC/FDM) to see whether unexplained reloads have already occurred. Keep the artefacts for forensics and any NIS2 incident notification.
      • Plan for continuity: A successful attack reloads the whole firewall node, not just the VPN service. Alert business-continuity owners, schedule maintenance windows and verify out-of-band management access.

    2. Runbook step 2

      Mitigation layers

      • Configuration change (temporary): If you cannot patch now, remove secondary authentication from exposed tunnel groups or move users to a group without secondary-authentication-server-group. If that secondary step is your second factor, enforce MFA another way, such as RADIUS/SAML MFA on the primary authentication. Record the trade-off in the risk register.
      • Network restriction: Limit who can reach the VPN listener (TCP/UDP 443 on outside). Use a control-plane ACL (access-group ... in interface outside control-plane) or an upstream router filter, with geo-blocking or partner allowlists where feasible.
      • On-box abuse throttling: Where your release supports it, enable threat-detection service remote-access-authentication and threat-detection service remote-access-client-initiations to shun sources that hammer the VPN portal.
      • Upstream IPS/DDoS layer: Rate-limit new TLS sessions to the VPN headend IP. Enable Cisco Talos Snort signatures for this CVE on an upstream IPS once published, because the vulnerable device cannot be relied on to protect itself.
      • Redundancy: Single-box sites should stage a fallback VPN headend on a different software level or product, so a forced reload does not take remote access down entirely.

    3. Runbook step 3

      Detection rules

      • Unexpected reloads (syslog): Alert on boot messages that have no matching admin reload: %ASA-5-199005 (Startup begin) and %ASA-6-199002 (Startup completed). KQL: CommonSecurityLog | where DeviceVendor == "Cisco" and DeviceEventClassID in ("199005","199002"). Correlate the results against change tickets.
      • SNMP/monitoring: Treat coldStart/warmStart traps or a sysUpTime reset on the firewall as an incident. For HA pairs, also watch for unplanned failover events (syslog 104001/104002).
      • Crash files: Poll show crashinfo (via Ansible/EEM) for new entries. A traceback referencing WebVPN/SSL VPN processes is a strong exploitation indicator.
      • Suspicious VPN traffic: In WebVPN (716xxx), SVC (722xxx) and AAA (113xxx) syslogs, look for bursts of connection attempts against tunnel groups with secondary authentication, especially from a single external IP shortly before a reload. In Zeek/Suricata, flag spikes in new TLS sessions to the headend and requests to /+CSCOE+/ or /+webvpn+/ from previously unseen sources.
      • Sigma shape: logsource: product: cisco, service: asa · selection: message|contains: '199005' · filter: preceding '111008'/'111010' (admin command) within 10 min · condition: selection and not filter.

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

    Source: BSI WID Portal

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    CiscoCisco Secure Firewall Adaptive Security Appliance (ASA) Software
    • 9.16.1
    • 9.16.1.28
    • 9.16.2
    • 9.16.2.11
    • 9.16.2.13
    • 9.16.2.14
    • 9.16.2.3
    • 9.16.2.7
    • 9.16.3
    • 9.16.3.14
    • 9.16.3.15
    • 9.16.3.19
    • 9.16.3.23
    • 9.16.3.3
    • 9.16.4
    • 9.16.4.103
    • 9.16.4.14
    • 9.16.4.18
    • 9.16.4.19
    • 9.16.4.27
    • 9.16.4.38
    • 9.16.4.39
    • 9.16.4.42
    • 9.16.4.48
    • 9.16.4.55
    • 9.16.4.57
    • 9.16.4.61
    • 9.16.4.62
    • 9.16.4.67
    • 9.16.4.70
    • 9.16.4.71
    • 9.16.4.76
    • 9.16.4.82
    • 9.16.4.84
    • 9.16.4.85
    • 9.16.4.89
    • 9.16.4.9
    • 9.16.4.92
    • 9.18.1
    • 9.18.1.3
    • 9.18.2
    • 9.18.2.5
    • 9.18.2.7
    • 9.18.2.8
    • 9.18.3
    • 9.18.3.39
    • 9.18.3.46
    • 9.18.3.53
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    From bundled advisories, not CVE-specific (2)

    Product list of a bundled advisory that does not state which product this CVE affects.

    Products from bundled advisories
    Affected versionsFixed in
    ciscocisco asa
    • < 7.0.11
    • < 9.16.4.104
    • 7.0.11
    • 9.16.4.104

    Vendors and products

    Affected operating systems

    Affected operating systems
    Otherciscoadaptive_security_appliance_software—
    Otherciscoadaptive_security_appliance_software9.24.10

    Weakness classes (CWE)

    • CWE-690Unchecked Return Value to NULL Pointer Dereference

      Compound

      The product does not check for an error after calling a function that can return with a NULL pointer if the function fails, which leads to a resultant NULL pointer dereference.

      Entry at MITRE CWE-690

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    CISA KEV CatalogCISA Known Exploited Vulnerability (opens in a new tab)cisa.govactively exploited
    HKCERTCisco Products Denial of Service Vulnerability (opens in a new tab)HKCERTactively exploited

    References & sources

    • sec.cloudapps.cisco.comcisco-sa-asaftd-tunnel-dos-s6mgkb75pwn-watch, Vendor advisory
    • pwn.watchpwn.watch: Cisco ASA and FTD zero-day CVE-2026-76418 exploited to crash SSL VPN firewallspwn-watch
    • NVD (NIST)NVD: CVE-2026-76418pwn-watch
    • bleepingcomputer.comNew Cisco firewall zero-day exploited to crash SSL VPN devicespwn-watch
    • thehackernews.comCisco Patches Actively Exploited ASA and FTD VPN Flaw That Can Crash Firewallspwn-watch
    • cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418government-resource, US government resource

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Initial analysis by NVDNVD

      Newly listed as affected:
      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Product configurationadded
      —
      OR *cpe:2.3:o:cisco:adaptive_security_appliance_software:9.24.10:*:*:*:*:*:*:* *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions up to (excluding) 9.16.4.104 *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.18 up to (excluding) 9.18.4.96 *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.22 up to (excluding) 9.22.3.200 *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.23 up to (excluding) 9.23.1.48 *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.24.1 up to (excluding) 9.24.1.27 *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.19 up to (excluding) 9.20.4.50
      Product configurationadded
      —
      OR *cpe:2.3:a:cisco:secure_firewall_threat_defense:10.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions up to (excluding) 7.0.11 *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions from (including) 10.0.0 up to (excluding) 10.0.3 *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (excluding) 7.2.13 *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions from (including) 7.6.0 up to (including) 7.6.7 *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions from (including) 7.7.0 up to (excluding) 7.7.14 *cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* versions from (including) 7.3.0 up to (excluding) 7.4.9
      Reference typeadded
      —
      Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75 Types: Vendor Advisory
      Reference typeadded
      —
      CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418 Types: US Government Resource

      Source identifier: nvd@nist.gov

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: active, automatable: yes

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentremoved
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T19:50:11.066278Z"}
      —
      SSVC assessmentadded
      —
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T00:00:00+00:00"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. CISA KEV entry updated9119a7d8…

      4 individual changes: Date Added, Due Date, Required Action, Vulnerability Name

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Date Addedadded
      —
      2026-10-29
      Due Dateadded
      —
      2026-10-29
      Required Actionadded
      —
      2026-10-29
      Vulnerability Nameadded
      —
      2026-10-29

      Source identifier: 9119a7d8-5eab-497f-8521-727c672e3725

    4. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: active, automatable: yes

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418
      SSVC assessmentremoved
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T00:00:00+00:00"}
      —
      SSVC assessmentadded
      —
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T19:50:11.066278Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    5. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentremoved
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T22:45:52.484574Z"}
      —
      SSVC assessmentadded
      —
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T00:00:00+00:00"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Show 2 older changes

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-76418","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T22:45:52.484574Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. ReceivedCisco

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

      Weakness type: CWE-690

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-690
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/76xxx/CVE-2026-76418.json">CVE-2026-76418</a>
      Referenceadded
      —
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

      Source identifier: psirt@cisco.com

    Linked CVEs

    Linked CVEs
    CriticalCVE-2026-76418Cisco Secure Firewall Threat Defense (FTD) Software: Unchecked Return Value to NULL Pointer Dereference8.6Actively exploited

    Linked advisories

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