CVE-2025-4918

CRITICAL

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/17/2025

Last Modified4/13/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mozilla:firefoxmozilla:thunderbird

Weaknesses (CWE)

CWE-125CWE-787

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1966612(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-36/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-37/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-38/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-40/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-41/(security@mozilla.org)

https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write(af854a3a-2127-422b-91ae-364da2661108)

https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.