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CVE-2025-54574

CriticalPublished

Squid's URN Handling can lead to Buffer Overflow

Published: Aug 1, 2025
Updated: Nov 5, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

22.7%

Moderate · next 30 days

Percentile: 97.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Blackash-CVE-2025-54574Exploit
Exploit script for CVE-2025-54574, a critical heap buffer overflow in Squid proxy (≤6.3) enabling remote code execution or denial-of-service with no authentication required.
CVE-2025-54574-Squid-Heap-Buffer-OverflowPoC
Vulnerability Found on Squid Proxy.

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