by Kastro
Paper/Archive/CVE-2025-1012

CVE-2025-1012

Mozilla Firefox — Use-after-free during concurrent delazification

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 39.3.393 × 207.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory115.20CNA
Thunderbirdsee advisory128.7CNA

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: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1939710refmozilla.org/security/advisories/mfsa2025-07refmozilla.org/security/advisories/mfsa2025-08refmozilla.org/security/advisories/mfsa2025-09refmozilla.org/security/advisories/mfsa2025-10refmozilla.org/security/advisories/mfsa2025-11reflists.debian.org/debian-lts-announce/2025/02/msg00006.htmlreflists.debian.org/debian-lts-announce/2025/02/msg00005.html