Mozilla Firefox up to 141 GMP memory corruption

Summaryinfo

A vulnerability has been found in Mozilla Firefox up to 141 and classified as critical. This impacts an unknown function of the component GMP. This manipulation causes memory corruption. The identification of this vulnerability is CVE-2025-9179. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 141. It has been declared as critical. Affected by this vulnerability is an unknown part of the component GMP. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 affects Firefox < 142, Firefox ESR < 115.27, Firefox ESR < 128.14, Firefox ESR < 140.2, Thunderbird < 142, Thunderbird < 128.14, and Thunderbird < 140.2.

It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is known as CVE-2025-9179 since 08/19/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/12/2025).

The vulnerability scanner Nessus provides a plugin with the ID 252327 (Mozilla Firefox ESR < 115.27), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 142 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (252327) and CERT Bund (WID-SEC-2025-1866). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• IGEL OS
• SUSE openSUSE
• RESF Rocky Linux
• Mozilla Firefox
• Mozilla Firefox ESR
• Mozilla Thunderbird

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 141

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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