CVE-2023-20269: Cisco Secure Firewall RAVPN DoS
Summary
Cisco Secure Firewall ASA and FTD allow denial of service via crafted IKEv2 packets targeting the RAVPN service.
Why It Matters
HIGH severity — known to be exploited in the wild（CISA KEV）；action required: Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices. ；affects Cisco Secure Firewall ASA 9.16, Cisco Secure Firewall ASA 9.17, Cisco Secure Firewall ASA 9.18 and more.
Current Status
- Vulnerability status: Known exploited (CISA KEV)
- Last intelligence update: 2026-10-27 · source: NVD
- CISA KEV added: 2023-09-13 · remediation deadline: 2023-10-04
Entity Activity Timeline
- 2023-09-13 — Added to CISA KEV as known-exploited · action: Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.
- 2023-08-23 — NVD publication / disclosure
- 2026-10-27 — Intelligence record updated（NVD sync）
Severity
HIGH
CVSS Score: 7.5
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Known Exploited (CISA KEV)
Known Exploited Vulnerability
Added: 2023-09-13 · Remediation deadline: 2023-10-04
Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.
Source Attribution
Source: NVD · Updated: 2026-10-27T00:00:00.000 · Confidence: high
Impact
Based on CVSS vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H — assess confidentiality, integrity, and availability impact via the official vector documentation.
Affected Software
- Cisco Secure Firewall ASA 9.16 (Unknown)
- Cisco Secure Firewall ASA 9.17 (Unknown)
- Cisco Secure Firewall ASA 9.18 (Unknown)
- Cisco FTD 7.2 (Unknown)
- Cisco FTD 7.3 (Unknown)
Fix
Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.
Sources & Evidence
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