Zero-day vulnerability in Cisco Adaptive Security Appliance (ASA)

Missing authorization
CVE-2025-20362

Vulnerability details

Advisory: SB2025092566 - Missing authorization in Cisco ASA and FTD

Vulnerable component: Cisco Adaptive Security Appliance (ASA)

CVE-ID: CVE-2025-20362

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-862 - Missing Authorization

Description:

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to improper validation of user-supplied input within the VPN Web Server. A remote attacker can send specially crafted HTTP request to a targeted web server on a device and access a restricted URL without authentication.

Note, the vulnerability is being exploited in the wild. 

External links:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.