{"id":"CVE-2025-30403","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-30403","generatedAt":"2026-10-27T23:58:33.465Z","title":"A heap-buffer-overflow vulnerability is possible in mvfst via a specially crafted message during a QUIC session.","description":"A heap-buffer-overflow vulnerability is possible in mvfst via a specially crafted message during a QUIC session. This issue affects mvfst versions prior to v2025.07.07.00.","published":"2025-07-11T19:15:23.000Z","lastModified":"2026-06-17T09:08:40.000Z","status":"Deferred","sourceIdentifier":"cve-assign@fb.com","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"},"cwe":[],"affected":[],"epss":{"score":0.0033,"percentile":0.25933,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/facebook/mvfst/commit/65b297332191de6e867c4a3139a233fc84c0e7e0","source":"cve-assign@fb.com"},{"url":"https://www.facebook.com/security/advisories/cve-2025-30403","source":"cve-assign@fb.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-30403","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."}