Paper/Archive/CVE-2025-4918

CVE-2025-4918

Mozilla Firefox — Out-of-bounds access when resolving Promise objects

CVSS 9.8 (ADP)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 95.5.955 × 2019.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Firefoxsee advisory115.23.1CNA

Thunderbirdsee advisory128.10.2CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1966612 refmozilla.org/security/advisories/mfsa2025-36 refmozilla.org/security/advisories/mfsa2025-37 refmozilla.org/security/advisories/mfsa2025-38 refmozilla.org/security/advisories/mfsa2025-40 refmozilla.org/security/advisories/mfsa2025-41 refvicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write refvicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write reflists.debian.org/debian-lts-announce/2025/05/msg00046.html reflists.debian.org/debian-lts-announce/2025/05/msg00024.html