CVE-2025-4093HIGH 8.1EPSS p30.3%

CVE-2025-4093CVE-2025-4093

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
EPSS0.39% probability of exploitation · percentile 30.3% · 2026-06-19T12:03:05Z
Published2025-04-29
Last modified2026-04-13

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

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