{"id":"CVE-2025-14321","title":"Use-after-free in the WebRTC: Signaling component","summary":"Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"mozilla","product":"firefox","affected":["firefox < 140.6.0","firefox < 146.0","thunderbird < 140.6.0","thunderbird < 146.0"],"patched":["firefox 146.0","thunderbird 146.0"],"published":"2025-12-09","updated":"2026-09-30","sourceUpdated":"2026-09-30T17:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-14321","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1992760","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-92/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-95/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-96/","label":"security@mozilla.org"}],"tags":["nvd","exploit-available"],"epss":0.00596,"epssPercentile":0.46471,"exploits":{"github":1,"githubRepos":["https://github.com/h3raklez/CVE-2025-14321"],"checkedAt":"2026-09-30T17:13:56.195Z"},"exploitAvailable":true,"ingestedAt":"2026-09-30T17:13:20.753Z","slug":"CVE-2025-14321","body":"## Overview\n\nUse-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.\n\n## Affected\n\n- `firefox < 140.6.0`\n- `firefox < 146.0`\n- `thunderbird < 140.6.0`\n- `thunderbird < 146.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 146.0`\n- `thunderbird 146.0`","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}