CVE-2025-4918CRITICAL 9.8EPSS p94.6%

CVE-2025-4918CVE-2025-4918

Description

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

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
EPSS8.93% probability of exploitation · percentile 94.6% · 2026-06-19T12:03:05Z
Published2025-05-17
Last modified2026-04-13

Underlying weaknesses· 2

CWE-125CWE-787

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1966612
  2. https://www.mozilla.org/security/advisories/mfsa2025-36/
  3. https://www.mozilla.org/security/advisories/mfsa2025-37/
  4. https://www.mozilla.org/security/advisories/mfsa2025-38/
  5. https://www.mozilla.org/security/advisories/mfsa2025-40/
  6. https://www.mozilla.org/security/advisories/mfsa2025-41/
  7. https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html
  8. https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html

2

TypeTargetConfidenceTier
WeaknessOut-of-bounds Readcwe-1250%live
WeaknessOut-of-bounds Writecwe-7870%live

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