VULNERABILITY INTELLIGENCE

CVE-2004-0189

CVSS score7.5 HIGH

EPSS probability13.81%

CISA KEVNot currently listed

Published2004-03-15

Last modified2026-06-16

Description

The "%xx" URL decoding function in Squid 2.5STABLE4 and earlier allows remote attackers to bypass url_regex ACLs via a URL with a NULL ("%00") character, which causes Squid to use only a portion of the requested URL when comparing it against the access control lists.