{"id":"CVE-2025-54574","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-54574","generatedAt":"2026-11-02T16:02:07.364Z","title":"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.","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.","published":"2025-08-01T18:15:55.000Z","lastModified":"2026-06-17T09:40:20.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-122","CWE-787"],"affected":["squid-cache/squid"],"epss":{"score":0.23965,"percentile":0.97839,"date":"2026-11-01","history":[{"date":"2026-10-02","score":0.23693,"percentile":0.97754}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 24.0%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/squid-cache/squid/releases/tag/SQUID_6_4","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3","tags":["Mitigation","Patch","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"http://www.openwall.com/lists/oss-security/2025/11/05/5","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-54574","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}