High [CVE-2026-20013 +2] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Denial of Service Vulnerabilities
This high-severity Cisco advisory covers CVE-2026-20013 and CVE-2026-20014 and 1 more CVE affecting Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.4.
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Summary
Multiple vulnerabilities in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow a remote attacker to leak memory when parsing IKEv2 packets, triggering a denial of service (DoS) condition.
For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities. This advisory is part of the March 2026 release…
Affected products named by the advisory: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2; Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3; Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.4; Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.5; and 3 more.
- Scope: These vulnerabilities affect Cisco Secure Firewall ASA Software and Secure FTD Software if they have the IKEv2 VPN feature enabled.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- There are no workarounds that address these vulnerabilities.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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