CVE-2025-4091 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox
Severity
8.1HIGHNVD
EPSS
0.4%
top 36.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedApr 29
Latest updateJul 22
Description
Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9
Affected Packages3 packages
🔴Vulnerability Details
3OSV▶
CVE-2025-4091: Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128↗2025-04-29
CVEList▶
Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10↗2025-04-29
GHSA▶
GHSA-jgr2-rf9j-5fh3: Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128↗2025-04-29