CVE-2025-4093HIGH 8.1EPSS p39.5%

CVE-2025-4093CVE-2025-4093

mozilla / firefox

Description

Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.48% probability of exploitation · percentile 39.5% · 2026-10-05T12:00:23Z
Published2025-04-29
Last modified2026-10-05

Underlying weaknesses· 1

CWE-119

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1894100
  2. https://www.mozilla.org/security/advisories/mfsa2025-29/
  3. https://www.mozilla.org/security/advisories/mfsa2025-32/
  4. https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html

1

TypeTargetConfidenceTier
WeaknessImproper Restriction of Operations within the Bounds of a Memory Buffercwe-1190%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2025-4091
CVE
CVE-2025-5269
CVE
CVE-2025-1017
CVE
CVE-2025-1020
CVE
CVE-2026-2793
CVE
CVE-2025-1016
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.