CVE-2025-0243
MEDIUM severity · CVSS 5.1 · Out-of-bounds write
5.1CVSS MEDIUM
Summary
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactLow
Integrity impactLow
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products we track (2)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2025-01/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-02/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-04/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-05/Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783
- https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html