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CVE-2025-11721

9.8 critical SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.8 · mozillaNVD modified 2026-10-18 21:10

Affected (CPE criteria) 2

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References 3