CVE-2026-20249
CVE-2026-20249: 1 tracked advisory record across Cisco. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Cisco
1 advisory- Advisory severityHigh8.6
High [CVE-2026-20249] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Certificate Authentication Denial of Service Vulnerability
cisco-sa-asaftd-ikev2cert-dos-uWyc2xtvSource published Source updated
A vulnerability in the certification authentication feature of Internet Key Exchange version 2 (IKEv2) for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly. This vulnerability is due to a logic error during the certificate authentication phase of the IKEv2 connection setup. An attacker could exploit this vulnerability by attempting to establish an IKEv2 VPN connection with a crafted certificate. A successful exploit could allow the attacker to cause the IKEv2 process to crash, causing a denial of service (DoS) condition. Cisco has released software updates that address this vulnerability. There are no workarounds that…
- Affected products in this advisory
- Secure Firewall Adaptive Security Appliance (ASA) Software
- Firepower 2100 Series
- Firepower 1000 Series
- ASA 5500-X Series Firewalls
4 more entries in the full advisory.
- Source-reported affected versions
- Scope: This vulnerability affects Cisco Secure Firewall ASA Software and Secure FTD Software if they have the IKEv2 VPN feature enabled with certificate authentication.
- Release N/A (first fixed: 9.16 and earlier / 9.18)
- Release 9.18.4.94 (first fixed: 9.18.4.135 / 9.20.4.235)
- Release 9.22 (first fixed: 9.20.4.49 / 9.22.3.26)
9 more entries in the full advisory.
- Source-reported fixed versions
- 9.16 and earlier / 9.18
- 9.18.4.135 / 9.20.4.235
- 9.20.4.49 / 9.22.3.26
- 9.23 / 9.23.1.47
8 more entries in the full advisory.
- Mitigation guidance
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release N/A: upgrade to 9.16 and earlier / 9.18.
- Release 9.18.4.94: upgrade to 9.18.4.135 / 9.20.4.235.
- Release 9.22: upgrade to 9.20.4.49 / 9.22.3.26.
5 more entries in the full advisory.
- Workarounds
- There are no workarounds that address this vulnerability.
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