CVE-2025-4087
MEDIUM severity · CVSS 4.8 · Out-of-bounds read
4.8CVSS MEDIUM
Summary
A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactLow
Integrity impactLow
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products we track (1)
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/mfsa2025-28/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-29/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=1952465
- https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html