HighCVE-2026-76418

Cisco Secure Firewall Threat Defense (FTD) Software: Unchecked Return Value to NULL Pointer Dereference (CVE-2026-76418)

Published 28.10.2026Last modified 29.10.2026Sources: HKCERT, CVE.org, Cisco PSIRT

Actively exploited
Source: VulnCheck KEV (opens in a new tab), HKCERT How we classify

What is affected, what to do

The vulnerability is being actively exploited; treat it as a priority. The available sources name no fixed version. Check the vendor guidance in the references 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

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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: HKCERT, CVE.org, Cisco PSIRT

—

EPSS score

No value is available for this vulnerability.

Show all metrics

Severity: High
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: 73.00 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 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
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: —
Published: 28.10.2026
CISA assessment (SSVC): Exploitation: none known · 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

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: HKCERT (CC BY 3.0 HK) · HKCERT rating: high, cvelistv5, NVD (NIST), cisco_csaf, CVE.org (MITRE)

Affected products

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

Affected products
		Affected versions	Fixed in
Cisco	Cisco Secure Firewall Adaptive Security Appliance (ASA) Software	`9.20.3.4` `9.23.1.32` `9.18.4.66` `9.18.2.7` `9.20.4.7` `9.24.1` `9.22.1.1` `9.20.3` `9.24.1.5` `9.22.2.20` `9.24.1.9` `9.22.3.5` `9.22.1.3` `9.16.4.62` `9.18.4.24` `9.20.4.10` `9.23.1.3` `9.22.2` `9.20.4.28` `9.23.1.19` `9.19.1.38` `9.20.3.20` `9.16.2.13` `9.20.4.30` `9.16.4.71` `9.18.4.50` `9.18.4` `9.18.4.67` `9.16.4` `9.18.4.52` `9.18.4.76` `9.16.4.19` `9.20.3.10` `9.23.1.13` `9.16.3.19` `9.20.3.13` `9.23.1` `9.16.4.57` `9.19.1.27` `9.24.1.155` `9.16.1` `9.19.1.9` `9.16.1.28` `9.22.2.13` `9.16.4.82` `9.18.4.53` `9.20.3.16` `9.19.1.37`	— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —

Vendors and products

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

HKCERT	Cisco Products Denial of Service Vulnerability (opens in a new tab)HKCERT	actively exploited	28.10.2026

References & sources

sec.cloudapps.cisco.comcisco-sa-asaftd-tunnel-dos-s6mgkb75

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).

29.10.2026Record modifiedCISA ADP

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

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	removed	{"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 assessment	added	—	{"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

28.10.2026Record modifiedCISA ADP

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

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"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

28.10.2026ReceivedCisco

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

New references:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

Show 5 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	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.
CVSS	added	—	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>
Reference	added	—	https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

Source identifier: psirt@cisco.com

Linked advisories

Cisco Patches Actively Exploited ASA and FTD VPN Flaw That Can Crash FirewallsThe Hacker News29.10.2026
Attackers Exploit Second Cisco Firewall VPN Zero-Day Since AugustSecurityWeek29.10.2026
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service VulnerabilityCisco PSIRT

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