| Package | Affected versions | Patched versions |
|---|---|---|
| adaptive security appliance | < 9.6 | 9.6 |
| secure firewall threat defense | ≥ 6.4.0, < 6.4.0.10≥ 6.5.0, < 6.6.1< 6.3.0.6 | 6.4.0.106.6.16.3.0.6 |
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.
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