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CVE-2004-0189

HighPublished

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,...

Published: Sep 1, 2004
Updated: Aug 8, 2024
Assigning CNA: mitre
Evidence observed: Mar 1, 2004

Primary CVSS

7.5/ 10High

nvd · CVSS 2.0

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS probability estimate

13.8%

Moderate · next 30 days

Percentile: 96.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Squid Proxy 2.4/2.5 - NULL URL Character Unauthorized AccessExploit
Mitch Adair · linux · Mar 1, 2004

Responsible use

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