Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | < 6.4 |
Related Weaknesses (CWE)
References
- https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35Patch
- https://github.com/squid-cache/squid/releases/tag/SQUID_6_4Release Notes
- https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3MitigationPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2025/11/05/5
- https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html
FAQ
What is CVE-2025-54574?
CVE-2025-54574 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 man...
How severe is CVE-2025-54574?
CVE-2025-54574 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-54574?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid.