Description
Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. 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 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
References (7)
Core 7
Core References
Broken Link, Issue Tracking
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1983838%2C1987624%2C1988244%2C1988912%2C1989734%2C1990085%2C1991899
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-81/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-83/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-84/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-85/
Scores
CVSS v3
8.8
EPSS
0.0006
EPSS Percentile
19.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-119
Status
published
Products (8)
mozilla/firefox
< 140.4.0
mozilla/firefox
< 144.0
Mozilla/Firefox
140.4 - 140.*
Mozilla/Firefox
144
mozilla/thunderbird
< 140.4.0
mozilla/thunderbird
< 144.0
Mozilla/Thunderbird
140.4 - 140.*
Mozilla/Thunderbird
144
Published
Oct 14, 2025
Tracked Since
Feb 18, 2026