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CVE-2025-54574

CRITICALCVSS 9.8/10EPSS 23.46%

Last modified

CVE-2025-54574 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 23.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
23.46%

97.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Squid-CacheSquid< 6.4

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2025-54574?
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.
How severe is CVE-2025-54574?
CVE-2025-54574 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 23.46% probability of exploitation in the next 30 days.
How do I fix CVE-2025-54574?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST