CVE-2025-11721CRITICAL 9.8EPSS p24.9%

CVE-2025-11721CVE-2025-11721

Description

Memory safety bug present in Firefox 143 and Thunderbird 143. 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 144 and Thunderbird 144.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.33% probability of exploitation · percentile 24.9% · 2026-06-18T12:00:27Z
Published2025-10-14
Last modified2026-04-13

Underlying weaknesses· 1

CWE-119

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1986816
  2. https://www.mozilla.org/security/advisories/mfsa2025-81/
  3. https://www.mozilla.org/security/advisories/mfsa2025-84/

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.