{"id":"CVE-2025-1931","title":"It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash","summary":"It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbi…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-416"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.21.0","firefox < 136.0","firefox >= 116.0, < 128.8.0","thunderbird < 128.8.0","thunderbird >= 129.0, < 136.0"],"patched":["firefox 128.8.0","thunderbird 136.0"],"published":"2025-03-04","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:10:01.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-1931","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1944126","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-14/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-15/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-16/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-17/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-18/","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00538,"epssPercentile":0.43242,"ingestedAt":"2026-09-30T19:21:07.227Z","slug":"CVE-2025-1931","body":"## Overview\n\nIt was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.\n\n## Affected\n\n- `firefox < 115.21.0`\n- `firefox < 136.0`\n- `firefox >= 116.0, < 128.8.0`\n- `thunderbird < 128.8.0`\n- `thunderbird >= 129.0, < 136.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 128.8.0`\n- `thunderbird 136.0`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}