CVE-2026-20101

A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to insufficient error checking when processing SAML messages. An attacker could exploit this vulnerability by sending crafted SAML messages to the SAML service. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

• cisco adaptive security appliance software (>= 9.12.1 < 9.16.4.85) • cisco adaptive security appliance software (>= 9.17.1 < 9.18.4.66) • cisco adaptive security appliance software (>= 9.19.1 < 9.20.4) • cisco adaptive security appliance software (>= 9.22.1.1 < 9.22.2.4) • cisco adaptive security appliance software (>= 9.23.1 < 9.23.1.7) • cisco secure firewall threat defense (>= 6.4.0 < 7.0.9) • cisco secure firewall threat defense (>= 7.1.0 < 7.2.11) • cisco secure firewall threat defense (>= 7.3.0 < 7.4.3) • cisco secure firewall threat defense (>= 7.6.0 < 7.6.4) • cisco secure firewall threat defense (>= 7.7.0 < 7.7.11)