Skip to main content
CRITICAL

CVE-2025-54574

CVSS v3

9.8

CRITICAL

EPSS Score

23.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for squid-cache.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2025-54574 Red Hat Product Security218 products fixed · 4 known affected

    squid-cache: Squid Buffer Overflow

    squid as a component of Red Hat Enterprise Linux 6 · squid.src as a component of Red Hat Enterprise Linux 6 · squid34 as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:14414 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: squid security update

  • RHSA-2024:1153 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: squid security update

  • RHSA-2024:0771 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: squid:4 security update

  • RHSA-2024:0773 Red Hat Product Security34 products fixed

    Red Hat Security Advisory: squid:4 security update

  • RHSA-2024:0772 Red Hat Product Security34 products fixed

    Red Hat Security Advisory: squid:4 security update

4 more advisories

Full record on NVD

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.

Technical details

Published
2025-08-01

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.

Is CVE-2025-54574 actively exploited?

Active exploitation of CVE-2025-54574 has not been confirmed. Its EPSS score was 23.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-54574?

CVE-2025-54574 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Running squid-cache? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database