CVE-2023-20109
Actively exploited. CVE-2023-20109 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Cisco IOS and IOS XE contain an out-of-bounds write vulnerability in the Group Encrypted Transport VPN (GET VPN) feature that could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute malicious code or cause a device to crash.
CSIRTS triage
- What
- Cisco IOS and IOS XE contain an out-of-bounds write vulnerability in the Group Encrypted Transport VPN feature.
- Who is affected
- Authenticated remote attackers with administrative control of a group member or key server.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Apply the latest security updates to address this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 82% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerabilitycisa-kev · 2023-10-10
External references
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