CVE-2025-1943HIGH 8.2EPSS p32.1%

CVE-2025-1943CVE-2025-1943

Description

Memory safety bugs present in Firefox 135 and Thunderbird 135. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 136 and Thunderbird 136.

Scoring

CVSS 3.18.2 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS0.40% probability of exploitation · percentile 32.1% · 2026-06-19T12:03:05Z
Published2025-03-04
Last modified2026-04-13

Underlying weaknesses· 1

CWE-122

References

  1. https://bugzilla.mozilla.org/buglist.cgi?bug_id=1869650%2C1938451%2C1940326%2C1944052%2C1944063%2C1947281
  2. https://www.mozilla.org/security/advisories/mfsa2025-14/
  3. https://www.mozilla.org/security/advisories/mfsa2025-17/

1

TypeTargetConfidenceTier
WeaknessHeap-based Buffer Overflowcwe-1220%live

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