CVE-2025-9179
Critical
Description
An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Mozilla Firefox
PublishedAug 19, 2025
First seenAug 19, 2025
Weakness typeCWE-119Memory buffer bounds error
How to fix
Update
- mozilla firefox115.27.0, 142.0, 128.14.0, 140.2.0 or later
- mozilla thunderbird128.14.0, 142.0, 140.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.27.0, v < 142.0, 128.0 ≤ v < 128.14.0, 140.0 ≤ v < 140.2.0 | 115.27.0, 142.0, 128.14.0, 140.2.0 |
| mozilla thunderbird | v < 128.14.0, v < 142.0, 140.0 ≤ v < 140.2.0 | 128.14.0, 142.0, 140.2.0 |
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.