CVE-2025-54574

9.3 CRITICAL
Published: August 01, 2025 Modified: November 05, 2025

Description

Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URN due to incorrect buffer management. This has been fixed in version 6.4. To work around this issue, disable URN access permissions.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
Source: security-advisories@github.com
Release Notes
https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
Source: security-advisories@github.com
Mitigation Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/11/05/5
Source: af854a3a-2127-422b-91ae-364da2661108

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.3 / 10.0
EPSS (Exploit Probability)
2.1%
84th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

squid-cache