CVE-2025-11715
Memory safety bugs fixed in Firefox ESR 140.4, Thunderbird ESR 140.4, Firefox 144 and Thunderbird 144
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 14, 2025 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/buglist.cgi?bug_id=1983838%2C1987624%2C1988244%2C1988912%2C1989734%2C1990085%2C1991899 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-81/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-83/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-84/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-85/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
Credits
The Mozilla Fuzzing Team