CVE-2025-54574

CRITICAL EPSS 97.5%
Published Aug 1, 202511mo ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Aug 1, 2025 11mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
97.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-122
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

VendorProductVersionRange
squid-cachesquid* <6.4

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2025/11/05/5
  • github.com https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
    Patch
  • github.com https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
    Release Notes
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
    MitigationPatchVendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html

Remediation

  • github.com https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
    Patch
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
    MitigationPatchVendor Advisory