CVE-2025-1017
CRITICAL severity · CVSS 9.8 · Out-of-bounds write
9.8CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2025-07/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-09/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-10/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-11/Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1926256%2C1935984%2C1935471
- https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html