CVE-2025-0243
5.1
MEDIUM
CVSS 3.1
EPSS 0.04%
Description
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
How to fix CVE-2025-0243
To remediate CVE-2025-0243, upgrade the affected package to a fixed version below.
- —upgrade to 128.6.0esr-1~deb11u3 or later
- —upgrade to 1:128.6.0esr-1~deb11u1 or later
Is CVE-2025-0243 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 128.6.0esr-1~deb11u3
- from 0, < 1:128.6.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |