vulnerability
MFSA2025-11 Thunderbird: Security Vulnerabilities fixed in Thunderbird 135 (CVE-2025-1012)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:H/Au:N/C:C/I:C/A:C) | Feb 4, 2025 | Feb 5, 2025 | May 20, 2026 |
Severity
8
CVSS
(AV:N/AC:H/Au:N/C:C/I:C/A:C)
Published
Feb 4, 2025
Added
Feb 5, 2025
Modified
May 20, 2026
Description
A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
Solution
mozilla-thunderbird-upgrade-135_0
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.