CVE-2025-6436 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox
CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer10 documents9 sources
Severity
8.1HIGHNVD
EPSS
0.1%
top 65.73%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJun 24
Latest updateFeb 2
Description
Memory safety bugs present in Firefox 139 and Thunderbird 139. 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 140 and Thunderbird 140.
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
3📋Vendor Advisories
5Debian▶
CVE-2025-6436: firefox - Memory safety bugs present in Firefox 139 and Thunderbird 139. Some of these bug...↗2025