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CVE-2025-54574

Squid-cache Squid remote code execution

9.3 CRITICALEPSS 23.7%
  1. Published1 Aug 2025

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityLow
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

Affected products

Squid-cache Squid< 6.4

Remediation

Fixed in
Squid-cache Squid≥ 6.4

References

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Frequently asked

Is CVE-2025-54574 being actively exploited?

CVE-2025-54574 is not in the CISA KEV catalog. Its EPSS exploit probability is 23.7%.

How severe is CVE-2025-54574?

CVE-2025-54574 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 23.7% probability of exploitation.

Which products are affected by CVE-2025-54574?

Affected products include Squid-cache Squid.

How do I fix CVE-2025-54574?

Upgrade affected software to a fixed version, for example Squid-cache Squid 6.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-54574 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.