CVE-2025-14321CRITICAL 9.8EPSS p38.7%

CVE-2025-14321CVE-2025-14321

Description

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.50% probability of exploitation · percentile 38.7% · 2026-06-18T12:00:27Z
Published2025-12-09
Last modified2026-04-13

Underlying weaknesses· 1

CWE-416

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1992760
  2. https://www.mozilla.org/security/advisories/mfsa2025-92/
  3. https://www.mozilla.org/security/advisories/mfsa2025-94/
  4. https://www.mozilla.org/security/advisories/mfsa2025-95/
  5. https://www.mozilla.org/security/advisories/mfsa2025-96/

1

TypeTargetConfidenceTier
WeaknessUse After Freecwe-4160%live

Related by meaning· 6

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.