CVE-2025-4918
thunderbird - security update
9.8
CRITICAL
CVSS 3.1
EPSS 0.99%
Description
An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
How to fix CVE-2025-4918
To remediate CVE-2025-4918, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 128.10.1esr-1~deb11u1 or later
- —upgrade to 128.10.1esr-1~deb12u1 or later
- —upgrade to 1:128.11.0esr-1~deb11u1 or later
- —upgrade to 1:128.11.0esr-1~deb11u1 or later
- —upgrade to 1:128.11.0esr-1~deb12u1 or later
Is CVE-2025-4918 being exploited?
Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 128.10.1esr-1~deb11u1
- from 0, < 128.10.1esr-1~deb12u1
- from 0, < 1:128.11.0esr-1~deb11u1
- from 0, < 1:128.11.0esr-1~deb11u1
- from 0, < 1:128.11.0esr-1~deb12u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |