CVE-2020-3572: 
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

A vulnerability (CVE-2020-3572) was discovered in the SSL/TLS session handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. The vulnerability was disclosed on October 21, 2020, and affects the SSL/TLS connection handling mechanisms in these security appliances. This security flaw could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on affected devices (Cisco Advisory, CVE Mitre).

The vulnerability stems from a memory leak that occurs when closing SSL/TLS connections in specific states. The issue is tracked under CWE-400 and affects the session handling mechanism of the security appliances. When SSL/TLS connections are terminated under certain conditions, the system fails to properly release allocated memory resources (Cisco Advisory).

The successful exploitation of this vulnerability can lead to a denial of service condition where the affected device becomes unable to process new SSL/TLS connections. The impact is significant as it requires manual intervention to recover the affected device, potentially causing service disruption for legitimate users (CVE Mitre).

An attacker can exploit this vulnerability by establishing multiple SSL/TLS sessions and ensuring they are closed under specific conditions. The attack can be performed remotely and does not require authentication, making it particularly concerning for exposed systems (Cisco Advisory).

Cisco has released software updates to address this vulnerability. Organizations using affected versions of Cisco ASA Software and Cisco FTD Software should upgrade to the patched versions as specified in the security advisory. There are no workarounds that address this vulnerability (Cisco Advisory).