CVE-2025-1017
Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. 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 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Feb 4, 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=1926256%2C1935984%2C1935471 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-07/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-09/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-10/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-11/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html
Credits
Sebastian Hengst, Maurice Dauer and the Mozilla Fuzzing Team