CVE-2022-20715: 
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

A vulnerability (CVE-2022-20715) was discovered in the remote access SSL VPN features of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. The vulnerability was first published on April 27, 2022, and received a CVSS base score of 8.6 (High). This security flaw affects systems running vulnerable releases of Cisco ASA Software or FTD Software with AnyConnect or WebVPN configurations (Cisco Advisory).

The vulnerability stems from improper validation of errors that are logged as a result of client connections made using remote access VPN. The issue is tracked as CWE-399 (Resource Management Errors) and CWE-20 (Improper Input Validation). The vulnerability received a CVSS v3.1 score of 8.6 (High) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H, indicating network accessibility, low attack complexity, and no required privileges or user interaction (Cisco Advisory).

A successful exploitation of this vulnerability could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. Specifically, the attacker could cause the affected device to restart, resulting in a service disruption (Cisco Advisory).

Cisco has released software updates that address this vulnerability. There are no workarounds available. For ASA Software, version 9.16.2.11 contains the fix. For FTD Software, versions 6.4.0.13, 6.6.5.2, 7.0.2, and 7.1.0 include the necessary patches. Customers are advised to upgrade to the fixed releases (Cisco Advisory).