CVE-2025-8033
Medium
Description
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mozilla Firefox
PublishedJul 22, 2025
First seenJul 22, 2025
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- mozilla firefox115.26.0, 141.0, 128.13.0, 140.1.0 or later
- mozilla thunderbird128.13.0, 141.0, 140.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.26.0, v < 141.0, 128.0 ≤ v < 128.13.0, 140.0 ≤ v < 140.1.0 | 115.26.0, 141.0, 128.13.0, 140.1.0 |
| mozilla thunderbird | v < 128.13.0, v < 141.0, 140.0 ≤ v < 140.1.0 | 128.13.0, 141.0, 140.1.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.