CVE-2025-5269HIGH 8.1EPSS p29.3%

CVE-2025-5269CVE-2025-5269

Description

Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. 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 128.11 and Thunderbird 128.11.

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
EPSS0.38% probability of exploitation · percentile 29.3% · 2026-06-19T12:03:05Z
Published2025-05-27
Last modified2026-04-13

Underlying weaknesses· 1

CWE-787

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1924108
  2. https://www.mozilla.org/security/advisories/mfsa2025-44/
  3. https://www.mozilla.org/security/advisories/mfsa2025-46/
  4. https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html
  5. https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html

1

TypeTargetConfidenceTier
WeaknessOut-of-bounds Writecwe-7870%live

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