CVE-2005-0194: Squid

High severity, CVSS 10.0. EPSS: 5.1% chance of exploitation in the next 30 days.

Squid 2.5, when processing the configuration file, parses empty Access Control Lists (ACLs), including proxy_auth ACLs without defined auth schemes, in a way that effectively removes arguments, which could allow remote attackers to bypass intended ACLs if the administrator ignores the parser warnings.

Affected products

• Squid Squid: version 2.0.patch1 only; version 2.0.patch2 only; version 2.0.pre1 only; version 2.0.release only; version 2.1.patch1 only; version 2.1.patch2 only; …

Published 2005-05-02. Last modified 2026-06-16.