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Squid CVE-2025-54574

CRITICAL
Heap-based Buffer Overflow (CWE-122)
2025-08-01 security-advisories@github.com
Heap Overflow Buffer Overflow RCE Squid Red Hat Suse
9.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.3 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
SUSE
CRITICAL
qualitative
Red Hat
8.9 HIGH
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 19:04 vuln.today
Patch released
Mar 28, 2026 - 19:04 nvd
Patch available
CVE Published
Aug 01, 2025 - 18:15 nvd
CRITICAL 9.3

DescriptionGitHub Advisory

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.

AnalysisAI

Squid is a caching proxy for the Web. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-122. 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. Affected products include: Squid-Cache Squid. Version information: version 6.4..

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.1 Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2025-54574 vulnerability details – vuln.today
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