CVE-2025-20238: 
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

A vulnerability (CVE-2025-20238) was discovered in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. The vulnerability was first published on August 14, 2025, and affects these software products regardless of device configuration. This security flaw has been assigned a CVSS base score of 6.0 (Medium) (Cisco Advisory).

The vulnerability stems from insufficient input validation of commands that are supplied by the user. It has been classified under CWE-1244 (Internal Asset Exposed to Unsafe Debug Access Level or State). The vulnerability has a CVSS v3.1 vector of CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N, indicating local access requirements, low attack complexity, and high privileges needed for exploitation (NVD, Cisco Advisory).

A successful exploitation of this vulnerability could allow an authenticated attacker with valid administrative credentials to execute arbitrary commands on the underlying operating system with root-level privileges. This gives the attacker complete control over the affected system, potentially compromising the security of the entire network infrastructure (Cisco Advisory).

Cisco has released software updates that address this vulnerability. No workarounds are available for this vulnerability. Customers are advised to upgrade to the fixed software versions as soon as possible. The Cisco Software Checker can be used to determine exposure to vulnerabilities and identify the appropriate upgrade path (Cisco Advisory).

The vulnerability was discovered during internal security testing by T.VE of the Cisco Advanced Security Initiatives Group (ASIG). This vulnerability is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication (Cisco Advisory).