CVE-2025-20237: 
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

CVE-2025-20237 is a vulnerability 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 was assigned a CVSS base score of 6.0 (Medium). This security flaw affects Cisco Secure Firewall ASA Software and Cisco Secure FTD Software, regardless of device configuration (Cisco Advisory).

The vulnerability is classified under CWE-146 (Improper Neutralization of Expression/Command Delimiters) and is characterized by insufficient input validation of commands supplied by users. The CVSS vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N, indicating local access, low attack complexity, high privileges required, no user interaction needed, and high impact on confidentiality and integrity (NVD).

A successful exploitation of this vulnerability allows an authenticated, local attacker to execute arbitrary commands on the underlying operating system with root-level privileges. The impact primarily affects system confidentiality and integrity, with no direct impact on availability (Cisco Advisory).

Cisco has released software updates that address this vulnerability. There are no workarounds available for this vulnerability. Customers are advised to upgrade to a fixed software version using the Cisco Software Checker to determine their exposure 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 advisory was part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication (Cisco Advisory).