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PatchSiren cyber security CVE debrief

CVE-2023-20269 Cisco CVE debrief

CVE-2023-20269 is a Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) unauthorized access vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2023-09-13. The supplied KEV metadata marks it as known exploited and notes known ransomware campaign use. Defenders should treat this as an urgent remediation item and follow Cisco’s mitigation guidance, including the group-lock and vpn-simultaneous-logins instructions referenced by CISA, or discontinue use on unsupported devices.

Vendor
Cisco
Product
Adaptive Security Appliance and Firepower Threat Defense
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-09-13
Original CVE updated
2023-09-13
Advisory published
2023-09-13
Advisory updated
2023-09-13

Who should care

Security teams operating Cisco ASA or FTD appliances, especially internet-facing remote access deployments, should prioritize this issue. Incident responders and vulnerability management teams should also account for the KEV status and the noted ransomware campaign use when scheduling remediation.

Technical summary

The supplied source corpus identifies CVE-2023-20269 as an unauthorized access vulnerability affecting Cisco ASA and FTD. CISA’s KEV entry confirms it as a known exploited issue and points to Cisco’s advisory for mitigation steps. No CVSS score or further technical breakdown was included in the supplied records, so validation should rely on the official Cisco advisory and NVD entry linked in the source.

Defensive priority

Urgent

Recommended defensive actions

  • Review Cisco’s advisory for CVE-2023-20269 and apply the vendor’s mitigation guidance for group-lock and vpn-simultaneous-logins.
  • If the affected device is unsupported, discontinue use as directed in the CISA KEV notes.
  • Prioritize exposed Cisco ASA/FTD instances for inventory, validation, and remediation.
  • Monitor for signs of unauthorized access and review authentication, VPN, and administrative access logs around the exposure window.
  • Use the official NVD and CVE record to confirm affected products and track any updated vendor guidance.

Evidence notes

CISA’s KEV source item names CVE-2023-20269 as a Cisco ASA/FTD unauthorized access vulnerability, sets dateAdded to 2023-09-13, and marks knownRansomwareCampaignUse as Known. The source metadata also references Cisco’s security advisory and NVD as supporting official sources. The supplied corpus did not include a CVSS score or the body of the vendor advisory.

Official resources

CISA KEV listed CVE-2023-20269 on 2023-09-13 with a due date of 2023-10-04. The supplied metadata also marks known ransomware campaign use as Known.