CVE-2020-3572

A vulnerability in the SSL/TLS session handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory leak when closing SSL/TLS connections in a specific state. An attacker could exploit this vulnerability by establishing several SSL/TLS sessions and ensuring they are closed under certain conditions. A successful exploit could allow the attacker to exhaust memory resources in the affected device, which would prevent it from processing new SSL/TLS connections, resulting in a DoS. Manual intervention is required to recover an affected device.

• cisco adaptive security appliance (< 9.6) • cisco secure firewall threat defense (< 6.3.0.6) • cisco secure firewall threat defense (>= 6.4.0 < 6.4.0.10) • cisco secure firewall threat defense (>= 6.5.0 < 6.6.1) • cisco adaptive security appliance software (>= 9.8.0 < 9.8.4.26) • cisco adaptive security appliance software (>= 9.9.0 < 9.9.2.80) • cisco adaptive security appliance software (>= 9.10.0 < 9.10.1.44) • cisco adaptive security appliance software (>= 9.12.0 < 9.12.4.4) • cisco adaptive security appliance software (>= 9.13.0 < 9.13.1.13) • cisco adaptive security appliance software (>= 9.14.0 < 9.14.1.19)