Security Advisory
CVE-2025-11721
9.8
CRITICAL
Vulnerability Description
Memory safety bug present in Firefox 143 and Thunderbird 143. 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 144 and Thunderbird 144.
Published Date
October 14, 2025
Official Source
NIST NVD Advisory