Is CVE-2004-0189 actively exploited?

CVE-2004-0189 has no public evidence of in-the-wild exploitation as of 2025-04-03.

What is the CVSS score for CVE-2004-0189?

CVE-2004-0189 has a CVSS score of 7.5 (UNKNOWN severity). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P.

How do I patch CVE-2004-0189?

Patch guidance is available from squid security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2004-0189.

CVE-2004-0189 - remediation guidance & executive summary

Q: Which products are affected by CVE-2004-0189?

7 products: squid squid, squid squid, squid squid, squid squid, squid squid, and 2 more.

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.

CVSS Metrics

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector: network
Access Cmplx: low
Auth: none
Confidentiality: partial
Integrity: partial
Availability: partial
Weaknesses: NVD-CWE-Other

Metadata

Primary Vendor: SQUID
Published: 3/15/2004
Last Modified: 4/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

squid : squidsquid : squidsquid : squidsquid : squidsquid : squidsquid : squidsquid : squid

Remediation Guidance

Executive Summary

View on NIST NVD