CVE-2025-1012
7.5
HIGH
CVSS 3.1
EPSS 0.43%
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.
How to fix CVE-2025-1012
To remediate CVE-2025-1012, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 128.7.0esr-1~deb11u1 or later
- Debian/thunderbird—upgrade to 1:128.7.0esr-1~deb11u1 or later
Is CVE-2025-1012 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 128.7.0esr-1~deb11u1
- from 0, < 1:128.7.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |