CVE-2025-54574CRITICAL 9.8EPSS p97.5%
CVE-2025-54574CVE-2025-54574
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 23.46% probability of exploitation · percentile 97.5% · 2026-06-18T12:00:27Z |
| Published | 2025-08-01 |
| Last modified | 2025-11-05 |
Underlying weaknesses· 2
References
- https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
- https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
- https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
- http://www.openwall.com/lists/oss-security/2025/11/05/5
- https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Heap-based Buffer Overflowcwe-122 | 0% | live |
| Weakness | Out-of-bounds Writecwe-787 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.