CVE-2025-1943
firefox: thunderbird: Memory safety bugs fixed in Firefox 136 and Thunderbird 136
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 4, 2025
Updated · November 21, 2025
Description
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs are present in Firefox 135 and Thunderbird 135. Some of these bugs show evidence of memory corruption and, with enough effort, some of these could be exploited to run arbitrary code.
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')