CVE-2025-11711
6.5
MEDIUM
CVSS 3.1
EPSS 0.03%
Description
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
How to fix CVE-2025-11711
To remediate CVE-2025-11711, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 140.4.0esr-1~deb11u1 or later
- —upgrade to 1:140.4.0esr-1~deb11u1 or later
Is CVE-2025-11711 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 140.4.0esr-1~deb11u1
- from 0, < 1:140.4.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |