CVE-2025-2817
HIGH severity · CVSS 8.8 · Path traversal
8.8CVSS HIGH
Summary
Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
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/mfsa2025-28/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-29/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-30/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-31/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-32/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1917536
- https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html