CriticalCVE-2023-20198

    Cisco IOS XE Web UI Privilege Escalation Vulnerability (CVE-2023-20198)

    Published In CISA KEV since Sources: SingCERT, NCSC NZ, pwn.watch, CVE.org

    What is affected, what to do

    Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker.

    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. Immediate actions, mitigation and detection rules are in the runbook below.

    Affected
    • Cisco IOS XE Software eq 16.1.1..16.1.1
    • Cisco IOS XE Software eq 16.1.2..16.1.2
    • Cisco IOS XE Software eq 16.1.3..16.1.3
    • Cisco IOS XE Software eq 16.2.1..16.2.1
    • Cisco IOS XE Software eq 16.2.2..16.2.2
    • Cisco IOS XE Software eq 16.3.1..16.3.1
    • Cisco IOS XE Software eq 16.3.2..16.3.2
    • Cisco IOS XE Software eq 16.3.3..16.3.3
    • Cisco IOS XE Software eq 16.3.1a..16.3.1a
    • Cisco IOS XE Software eq 16.3.4..16.3.4
    • Cisco IOS XE Software eq 16.3.5..16.3.5
    • Cisco IOS XE Software eq 16.3.5b..16.3.5b
    • Cisco IOS XE Software eq 16.3.6..16.3.6
    • Cisco IOS XE Software eq 16.3.7..16.3.7
    • Cisco IOS XE Software eq 16.3.8..16.3.8
    • Cisco IOS XE Software eq 16.3.9..16.3.9
    • Cisco IOS XE Software eq 16.3.10..16.3.10
    • Cisco IOS XE Software eq 16.3.11..16.3.11
    • Cisco IOS XE Software eq 16.4.1..16.4.1
    • Cisco IOS XE Software eq 16.4.2..16.4.2
    • Cisco IOS XE Software eq 16.4.3..16.4.3
    • Cisco IOS XE Software eq 16.5.1..16.5.1
    • Cisco IOS XE Software eq 16.5.1a..16.5.1a
    • Cisco IOS XE Software eq 16.5.1b..16.5.1b
    • Cisco IOS XE Software eq 16.5.2..16.5.2
    • Cisco IOS XE Software eq 16.5.3..16.5.3
    • Cisco IOS XE Software eq 16.6.1..16.6.1
    • Cisco IOS XE Software eq 16.6.2..16.6.2
    • Cisco IOS XE Software eq 16.6.3..16.6.3
    • Cisco IOS XE Software eq 16.6.4..16.6.4
    • Cisco IOS XE Software eq 16.6.5..16.6.5
    • Cisco IOS XE Software eq 16.6.4a..16.6.4a
    • Cisco IOS XE Software eq 16.6.5a..16.6.5a
    • Cisco IOS XE Software eq 16.6.6..16.6.6
    • Cisco IOS XE Software eq 16.6.7..16.6.7
    • Cisco IOS XE Software eq 16.6.8..16.6.8
    • Cisco IOS XE Software eq 16.6.9..16.6.9
    • Cisco IOS XE Software eq 16.6.10..16.6.10
    • Cisco IOS XE Software eq 16.7.1..16.7.1
    • Cisco IOS XE Software eq 16.7.1a..16.7.1a
    • Cisco IOS XE Software eq 16.7.1b..16.7.1b
    • Cisco IOS XE Software eq 16.7.2..16.7.2
    • Cisco IOS XE Software eq 16.7.3..16.7.3
    • Cisco IOS XE Software eq 16.7.4..16.7.4
    • Cisco IOS XE Software eq 16.8.1..16.8.1
    • Cisco IOS XE Software eq 16.8.1a..16.8.1a
    • Cisco IOS XE Software eq 16.8.1b..16.8.1b
    • Cisco IOS XE Software eq 16.8.1s..16.8.1s
    • Cisco IOS XE Software eq 16.8.1c..16.8.1c
    • Cisco IOS XE Software eq 16.8.1d..16.8.1d
    • Cisco IOS XE Software eq 16.8.2..16.8.2
    • Cisco IOS XE Software eq 16.8.1e..16.8.1e
    • Cisco IOS XE Software eq 16.8.3..16.8.3
    • Cisco IOS XE Software eq 16.9.1..16.9.1
    • Cisco IOS XE Software eq 16.9.2..16.9.2
    • Cisco IOS XE Software eq 16.9.1a..16.9.1a
    • Cisco IOS XE Software eq 16.9.1b..16.9.1b
    • Cisco IOS XE Software eq 16.9.1s..16.9.1s
    • Cisco IOS XE Software eq 16.9.3..16.9.3
    • Cisco IOS XE Software eq 16.9.4..16.9.4
    • Cisco IOS XE Software eq 16.9.3a..16.9.3a
    • Cisco IOS XE Software eq 16.9.5..16.9.5
    • Cisco IOS XE Software eq 16.9.5f..16.9.5f
    • Cisco IOS XE Software eq 16.9.6..16.9.6
    • Cisco IOS XE Software eq 16.9.7..16.9.7
    • Cisco IOS XE Software eq 16.9.8..16.9.8
    • Cisco IOS XE Software eq 16.10.1..16.10.1
    • Cisco IOS XE Software eq 16.10.1a..16.10.1a
    • Cisco IOS XE Software eq 16.10.1b..16.10.1b
    • Cisco IOS XE Software eq 16.10.1s..16.10.1s
    • Cisco IOS XE Software eq 16.10.1c..16.10.1c
    • Cisco IOS XE Software eq 16.10.1e..16.10.1e
    • Cisco IOS XE Software eq 16.10.1d..16.10.1d
    • Cisco IOS XE Software eq 16.10.2..16.10.2
    • Cisco IOS XE Software eq 16.10.1f..16.10.1f
    • Cisco IOS XE Software eq 16.10.1g..16.10.1g
    • Cisco IOS XE Software eq 16.10.3..16.10.3
    • Cisco IOS XE Software eq 16.11.1..16.11.1
    • Cisco IOS XE Software eq 16.11.1a..16.11.1a
    • Cisco IOS XE Software eq 16.11.1b..16.11.1b
    • Cisco IOS XE Software eq 16.11.2..16.11.2
    • Cisco IOS XE Software eq 16.11.1s..16.11.1s
    • Cisco IOS XE Software eq 16.12.1..16.12.1
    • Cisco IOS XE Software eq 16.12.1s..16.12.1s
    • Cisco IOS XE Software eq 16.12.1a..16.12.1a
    • Cisco IOS XE Software eq 16.12.1c..16.12.1c
    • Cisco IOS XE Software eq 16.12.1w..16.12.1w
    • Cisco IOS XE Software eq 16.12.2..16.12.2
    • Cisco IOS XE Software eq 16.12.1y..16.12.1y
    • Cisco IOS XE Software eq 16.12.2a..16.12.2a
    • Cisco IOS XE Software eq 16.12.3..16.12.3
    • Cisco IOS XE Software eq 16.12.8..16.12.8
    • Cisco IOS XE Software eq 16.12.2s..16.12.2s
    • Cisco IOS XE Software eq 16.12.1x..16.12.1x
    • Cisco IOS XE Software eq 16.12.1t..16.12.1t
    • Cisco IOS XE Software eq 16.12.4..16.12.4
    • Cisco IOS XE Software eq 16.12.3s..16.12.3s
    • Cisco IOS XE Software eq 16.12.3a..16.12.3a
    • Cisco IOS XE Software eq 16.12.4a..16.12.4a
    • Cisco IOS XE Software eq 16.12.5..16.12.5
    • Cisco IOS XE Software eq 16.12.6..16.12.6
    • Cisco IOS XE Software eq 16.12.1z1..16.12.1z1
    • Cisco IOS XE Software eq 16.12.5a..16.12.5a
    • Cisco IOS XE Software eq 16.12.5b..16.12.5b
    • Cisco IOS XE Software eq 16.12.1z2..16.12.1z2
    • Cisco IOS XE Software eq 16.12.6a..16.12.6a
    • Cisco IOS XE Software eq 16.12.7..16.12.7
    • Cisco IOS XE Software eq 16.12.9..16.12.9
    • Cisco IOS XE Software eq 16.12.10..16.12.10
    • Cisco IOS XE Software eq 17.1.1..17.1.1
    • Cisco IOS XE Software eq 17.1.1a..17.1.1a
    • Cisco IOS XE Software eq 17.1.1s..17.1.1s
    • Cisco IOS XE Software eq 17.1.1t..17.1.1t
    • Cisco IOS XE Software eq 17.1.3..17.1.3
    • Cisco IOS XE Software eq 17.2.1..17.2.1
    • Cisco IOS XE Software eq 17.2.1r..17.2.1r
    • Cisco IOS XE Software eq 17.2.1a..17.2.1a
    • Cisco IOS XE Software eq 17.2.1v..17.2.1v
    • Cisco IOS XE Software eq 17.2.2..17.2.2
    • Cisco IOS XE Software eq 17.2.3..17.2.3
    • Cisco IOS XE Software eq 17.3.1..17.3.1
    • Cisco IOS XE Software eq 17.3.2..17.3.2
    • Cisco IOS XE Software eq 17.3.3..17.3.3
    • Cisco IOS XE Software eq 17.3.1a..17.3.1a
    • Cisco IOS XE Software eq 17.3.1w..17.3.1w
    • Cisco IOS XE Software eq 17.3.2a..17.3.2a
    • Cisco IOS XE Software eq 17.3.1x..17.3.1x
    • Cisco IOS XE Software eq 17.3.1z..17.3.1z
    • Cisco IOS XE Software eq 17.3.4..17.3.4
    • Cisco IOS XE Software eq 17.3.5..17.3.5
    • Cisco IOS XE Software eq 17.3.4a..17.3.4a
    • Cisco IOS XE Software eq 17.3.6..17.3.6
    • Cisco IOS XE Software eq 17.3.4b..17.3.4b
    • Cisco IOS XE Software eq 17.3.4c..17.3.4c
    • Cisco IOS XE Software eq 17.3.5a..17.3.5a
    • Cisco IOS XE Software eq 17.3.5b..17.3.5b
    • Cisco IOS XE Software eq 17.3.7..17.3.7
    • Cisco IOS XE Software eq 17.3.8..17.3.8
    • Cisco IOS XE Software eq 17.4.1..17.4.1
    • Cisco IOS XE Software eq 17.4.2..17.4.2
    • Cisco IOS XE Software eq 17.4.1a..17.4.1a
    • Cisco IOS XE Software eq 17.4.1b..17.4.1b
    • Cisco IOS XE Software eq 17.4.2a..17.4.2a
    • Cisco IOS XE Software eq 17.5.1..17.5.1
    • Cisco IOS XE Software eq 17.5.1a..17.5.1a
    • Cisco IOS XE Software eq 17.5.1b..17.5.1b
    • Cisco IOS XE Software eq 17.5.1c..17.5.1c
    • Cisco IOS XE Software eq 17.6.1..17.6.1
    • Cisco IOS XE Software eq 17.6.2..17.6.2
    • Cisco IOS XE Software eq 17.6.1w..17.6.1w
    • Cisco IOS XE Software eq 17.6.1a..17.6.1a
    • Cisco IOS XE Software eq 17.6.1x..17.6.1x
    • Cisco IOS XE Software eq 17.6.3..17.6.3
    • Cisco IOS XE Software eq 17.6.1y..17.6.1y
    • Cisco IOS XE Software eq 17.6.1z..17.6.1z
    • Cisco IOS XE Software eq 17.6.3a..17.6.3a
    • Cisco IOS XE Software eq 17.6.4..17.6.4
    • Cisco IOS XE Software eq 17.6.1z1..17.6.1z1
    • Cisco IOS XE Software eq 17.6.5..17.6.5
    • Cisco IOS XE Software eq 17.6.6..17.6.6
    • Cisco IOS XE Software eq 17.7.1..17.7.1
    • Cisco IOS XE Software eq 17.7.1a..17.7.1a
    • Cisco IOS XE Software eq 17.7.1b..17.7.1b
    • Cisco IOS XE Software eq 17.7.2..17.7.2
    • Cisco IOS XE Software eq 17.10.1..17.10.1
    • Cisco IOS XE Software eq 17.10.1a..17.10.1a
    • Cisco IOS XE Software eq 17.10.1b..17.10.1b
    • Cisco IOS XE Software eq 17.8.1..17.8.1
    • Cisco IOS XE Software eq 17.8.1a..17.8.1a
    • Cisco IOS XE Software eq 17.9.1..17.9.1
    • Cisco IOS XE Software eq 17.9.1w..17.9.1w
    • Cisco IOS XE Software eq 17.9.2..17.9.2
    • Cisco IOS XE Software eq 17.9.1a..17.9.1a
    • Cisco IOS XE Software eq 17.9.1x..17.9.1x
    • Cisco IOS XE Software eq 17.9.1y..17.9.1y
    • Cisco IOS XE Software eq 17.9.3..17.9.3
    • Cisco IOS XE Software eq 17.9.2a..17.9.2a
    • Cisco IOS XE Software eq 17.9.1x1..17.9.1x1
    • Cisco IOS XE Software eq 17.9.3a..17.9.3a
    • Cisco IOS XE Software eq 17.9.4..17.9.4
    • Cisco IOS XE Software eq 17.9.1y1..17.9.1y1
    • Cisco IOS XE Software eq 17.11.1..17.11.1
    • Cisco IOS XE Software eq 17.11.1a..17.11.1a
    • Cisco IOS XE Software eq 17.12.1..17.12.1
    • Cisco IOS XE Software eq 17.12.1a..17.12.1a
    • Cisco IOS XE Software eq 17.11.99SW..17.11.99SW

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

    Metrics

    10.0

    Priority

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

    Source: NVD, CVSS v3

    10.0

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: SingCERT, NCSC NZ, pwn.watch, CVE.org

    99.61 %

    EPSS score

    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

    Source: FIRST EPSS, percentile 99.95

    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
    233.57 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: CERT.at, ANSSI / CERT-FR, NCSC NZ, CSA/SingCERT 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
    10.0 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
    10.0
    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
    99.61 %
    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
    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
    99.95
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    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
    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-420

    Response and mitigation

    Why act now?

    Prioritisation rationale

    The flaw is reachable over the network without authentication or user interaction, crosses a scope boundary, and hands over full control of the device. It sits among the CVEs with the very highest exploitation likelihood. Shortly after disclosure, tens of thousands of internet-facing IOS XE devices were mass-implanted worldwide. Targets were typically edge routers and switches at service providers, public sector bodies and industrial operators, which were then used as durable footholds into internal networks. CISA does not flag known ransomware use. Even so, any IOS XE device with a Web UI reachable from untrusted networks should be treated as critical and handled immediately. Devices with the HTTP server disabled or a strictly ACL-restricted management plane can follow the normal patch cycle.

    1. Runbook step 1

      Immediate response (0-24 h)

      • Disable the HTTP/HTTPS server on every IOS XE device immediately unless the Web UI is strictly required. Run no ip http server and no ip http secure-server in global config, then copy running-config startup-config. This is the only reliable way to close the attack vector. Also check for non-default ports with show running-config | include ip http.
      • Patch: Fixes are tracked under bug ID CSCwh87343 and cover both CVE-2023-20198 and CVE-2023-20273. A patch is available from the vendor. Look up the exact fixed version for each release train in the vendor advisory or with the Cisco Software Checker. Upgrading alone does not remove rogue accounts that already exist.
      • Inventory exposure: Identify all IOS XE switches, routers and WLCs whose Web UI (TCP 80/443 or a custom port) is reachable from the internet or from untrusted segments. These devices go to the front of the compromise-assessment queue.
      • Check for compromise: Run show running-config | include username and look for unknown privilege 15 local accounts. Publicly reported names include random strings and Cisco-lookalikes such as cisco_tac_admin, cisco_support and cisco_sys_manager. Run the implant check from the Cisco advisory: an HTTP POST to /webui/logoutconfirm.html?logon_hash=1. A hexadecimal response indicates an active implant. Later implant variants can evade this check, so a negative result is not conclusive.
      • If compromise is suspected: Treat the device as fully owned. Preserve config and logs before any reboot, because the implant is non-persistent and a reboot destroys evidence. Then delete rogue accounts, rotate all local credentials, enable secrets, SNMP communities and TACACS+/RADIUS shared keys, and diff the config against a known-good baseline.
      • Reporting: NIS2 and KRITIS entities must assess whether this is a significant incident. The early warning to the BSI or your national CSIRT is due within 24 h.

    2. Runbook step 2

      Mitigation layers

      • Network segmentation: Allow Web UI access only from a dedicated management VLAN or jump host. Block inbound TCP 80/443 to infrastructure management addresses at the perimeter.
      • Device ACL: If the Web UI must stay on, restrict it with ip http access-class ipv4 <ACL> to defined admin source ranges. The advisory notes this restriction covers only the Web UI itself. Review NETCONF/RESTCONF exposure separately.
      • IPS/WAF: Enable the vendor Snort/Suricata signatures for CVE-2023-20198/CVE-2023-20273 on traffic towards network devices. Add a custom rule for requests to /webui/ that use odd path encoding (e.g. double URL-encoded %2525), and for POSTs to /webui/logoutconfirm.html from non-admin sources.
      • AAA hardening: Centralise authentication on TACACS+ with command accounting. Keep local privilege-15 accounts to a single monitored break-glass account. Require every new local user to be justified through change management.
      • Config integrity: Run automated config backups (e.g. Oxidized or RANCID) with diff alerting on any new username line.

    3. Runbook step 3

      Detection rules

      • Device syslog: Look for %SYS-5-CONFIG_P triggered by an unknown user or by a process such as SEP_webui_wsma_http. Also flag %SEC_LOGIN-5-WEBLOGIN_SUCCESS for unfamiliar usernames. SPL: index=network "%SYS-5-CONFIG_P" "SEP_webui_wsma_http"
      • Implant install: The syslog message %WEBUI-6-INSTALL_OPERATION_INFO containing install add file with an unknown filename indicates CVE-2023-20273 exploitation. Sigma shape: logsource: cisco ios, keywords: ['%WEBUI-6-INSTALL_OPERATION_INFO'].
      • Network telemetry (Zeek/Suricata): Watch for HTTP sessions from external IPs to management interfaces, especially POSTs to /webui/logoutconfirm.html or /%2577ebui_wsma_http. Zeek approach: filter http.log where uri contains wsma or logon_hash and id.orig_h is outside the admin ranges.
      • Config drift: Alert on any new username ... privilege 15 line that has no matching change ticket. Also alert on TACACS+ accounting records for accounts that do not exist in the central directory.
      • Retro-hunt: Search logs and NetFlow back to mid-September 2023 for these patterns, since exploitation predates disclosure.

    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

    Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.

    Source: CSA/SingCERT, NCSC NZ (CC BY 4.0), pwn.watch, NVD (NIST), cvelistv5, CISA KEV Catalog, 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 versionsFixed in
    CiscoCisco IOS XE Software
    • 16.12.1x
    • 16.8.1a
    • 17.3.1z
    • 17.2.1
    • 17.3.8
    • 17.3.3
    • 17.9.1y
    • 16.6.2
    • 17.9.1x
    • 16.11.1b
    • 16.10.3
    • 16.9.3a
    • 17.6.1y
    • 16.10.1e
    • 17.12.1a
    • 16.12.1t
    • 17.3.5b
    • 16.5.3
    • 17.9.1y1
    • 17.4.1
    • 16.12.1w
    • 17.6.1x
    • 16.3.5b
    • 16.2.2
    • 16.12.1s
    • 16.4.2
    • 17.11.1
    • 16.7.2
    • 17.3.4b
    • 17.9.1w
    • 17.10.1
    • 16.10.2
    • 16.9.6
    • 17.1.1
    • 17.6.2
    • 17.3.7
    • 16.8.3
    • 16.11.1s
    • 17.9.3
    • 17.6.3
    • 17.5.1a
    • 16.12.8
    • 16.12.1
    • 17.7.1b
    • 17.3.5a
    • 16.3.4
    • 16.3.6
    • 17.6.6
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    Vendors and products

    Affected operating systems

    Affected operating systems
    Mobileciscoios_xe—
    Otherrockwellautomationallen-bradley_stratix_5200_firmware—
    Otherrockwellautomationallen-bradley_stratix_5800_firmware—

    Weakness classes (CWE)

    • CWE-420Unprotected Alternate Channel

      Base

      The product protects a primary channel, but it does not use the same level of protection for an alternate channel.

      Entry at MITRE CWE-420

    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
    CSA/SingCERTActive Exploitation of Cisco Internetworking Operating System eXtended Edition (opens in a new tab)CSA/SingCERTactively exploited
    CSA/SingCERTActive Exploitation of Critical Zero-Day Vulnerability in Cisco IOS XE Software (opens in a new tab)CSA/SingCERTactively exploited
    NCSC NZCisco IOS XE Web UI actively exploited (opens in a new tab)NCSC NZactively exploited
    ANSSI / CERT-FRLicence Ouverte 2.0, as of CERTFR-2023-ALE-011 – [MàJ] Multiples vulnérabilités dans Cisco IOS XE (clôturée 2024-02-16) (opens in a new tab)cert.cyber.gouv.fractively exploited

    References & sources

    • sec.cloudapps.cisco.comcisco-sa-iosxe-webui-privesc-j22SaA4zMitigation, Vendor advisory, pwn-watch
    • cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2023-20198government-resource, US government resource
    • cert.atCERT.at: Update #2: Kritische Sicherheitslücke in Cisco IOS XE - aktiv ausgenütztcert-at
    • cert.cyber.gouv.frANSSI / CERT-FR: CERTFR-2023-ALE-011 – [MàJ] Multiples vulnérabilités dans Cisco IOS XE (clôturée 2024-02-16)cert-fr
    • pwn.watchpwn.watch: Cisco IOS XE web UI zero-days: implants on tens of thousands of devicespwn-watch
    • blog.talosintelligence.comActive exploitation of Cisco IOS XE Software Web Management User Interface vulnerabilitypwn-watch
    • cisa.govGuidance for Addressing Cisco IOS XE Web UI Vulnerabilitiespwn-watch
    • NVD (NIST)NVD: CVE-2023-20198pwn-watch
    • NVD (NIST)NVD: CVE-2023-20273pwn-watch
    • cisa.govCISA Known Exploited Vulnerabilities Catalogpwn-watch
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