CVE-2026-20015

A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may impact the availability of services to devices elsewhere in the network. This vulnerability is due to a memory leak when parsing IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit could allow the attacker to exhaust resources, causing a DoS condition that will eventually require the device to be manually reloaded.

• cisco adaptive security appliance software (>= 9.18.1 < 9.18.4.71) • cisco adaptive security appliance software (>= 9.19.1 < 9.20.4.10) • cisco adaptive security appliance software (>= 9.22.1.1 < 9.22.2.13) • cisco adaptive security appliance software (>= 9.23.1 < 9.23.1.19) • cisco secure firewall threat defense (>= 7.2.0 < 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)