VulnerabilityModified
CVE-2025-54574
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.
CRITICAL 9.8EPSS 22.7%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 22.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 22.67% probability · 98th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-787
- Affected
- squid-cache/squid
- Source
- security-advisories@github.com
References
- https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988Patch
- https://github.com/squid-cache/squid/releases/tag/SQUID_6_4Release Notes
- https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3Mitigation, Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/11/05/5
- https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.