critical9.8
CVE-2025-11721
Memory safety bug present in Firefox 143 and Thunderbird 143.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mozilla | Firefox | from 143.0 before 144.0 |
| Mozilla | Thunderbird | from 143.0 before 144.0 |