CVE-2025-5269
Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
- State
- Published
- Severity
- 8.1 High
- Published
- May 27, 2025
- Updated
- Apr 13, 2026
- Reserved
- May 27, 2025
Description
Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.11 and Thunderbird 128.11.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
- https://www.mozilla.org/security/advisories/mfsa2025-44/
- https://www.mozilla.org/security/advisories/mfsa2025-46/
- https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html
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