8.6
High
CVE-2026-20249 A vulnerability in the certification authentication feature of Internet Key Exchange version 2 (IKEv2) for Cisco…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.24 | 9.24.1 → 9.24.1.155 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23 | 9.23.1 → 9.23.1.195 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22 | 9.22.1.1 → 9.22.3 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20 | 9.20.1 → 9.20.4.30 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19 | 9.19.1 → 9.19.1.42 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18 | 9.18.1 → 9.18.4.135 | No fix stated |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16 | 9.16.1 → 9.16.4.92 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software | 10.0.0 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.7 | 7.7.0 → 7.7.11 | No fix stated |
Show the 5 other branches Hide the 5 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | 7.6.0 → 7.6.4 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | 7.4.0 → 7.4.7 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | 7.3.0 → 7.3.1.2 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | 7.2.0 → 7.2.11 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.0 | 7.0.0 → 7.0.9 | No fix stated |
References
- cisco-sa-asaftd-ikev2cert-dos-uWyc2xtv sec.cloudapps.cisco.com
Timeline
- Published
- Last modified
Other CVEs of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
The 48 CVEs of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software →
CVE-2026-76418
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
8.6
High
CVE-2026-20121
A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall…
5.3
Medium
CVE-2026-20120
A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall…
5.8
Medium
CVE-2026-20248
A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software…
6.8
Medium