CVE-2025-11715
High
Description
Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. 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 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedOct 14, 2025
First seenOct 14, 2025
Weakness typeCWE-119Memory buffer bounds error
How to fix
Update
- mozilla firefox140.4.0, 144.0 or later
- mozilla thunderbird140.4.0, 144.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 140.4.0, v < 144.0 | 140.4.0, 144.0 |
| mozilla thunderbird | v < 140.4.0, v < 144.0 | 140.4.0, 144.0 |
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