CVE-2025-54574

Squid's URN Handling can lead to Buffer Overflow

Published Aug 1, 2025 CVSS 3.1 · 9.3 Critical EPSS 22.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4312-1 squid security update
Debian DSA Debian DSA DSA-5982-1 squid security update
EUVD EUVD EUVD-2025-23392 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.
History
Type Values Removed Values Added
Weaknesses CWE-787
CPEs cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Squid-cache
Squid-cache squid
Vendors & Products Squid-cache
Squid-cache squid
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Squid's URN Handling can lead to Buffer Overflow
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 9.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 5, 2025, 5:04 PM
Reserved
Jul 25, 2025, 4:19 PM
Status
Modified
Published
Aug 1, 2025, 6:15 PM
Modified
Jun 17, 2026, 9:40 AM
Severity
Important
Public date
Aug 1, 2025, 6:02 PM