Mozilla Firefox up to 146.0.0 memory corruption

Summaryinfo

A vulnerability marked as critical has been reported in Mozilla Firefox up to 146.0.0. Impacted is an unknown function. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2025-14861. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 146.0.0 and classified as critical. This issue affects an unknown code. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Memory safety bugs present in Firefox 146. 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 affects Firefox < 146.0.1.

The advisory is shared at bugzilla.mozilla.org. The identification of this vulnerability is CVE-2025-14861 since 12/18/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 12/20/2025).

The vulnerability scanner Nessus provides a plugin with the ID 279186 (Mozilla Firefox < 146.0.1), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 146.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (279186) and CERT Bund (WID-SEC-2025-2885). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Mozilla Firefox

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 146.0

License

• open-source

Website

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

CPE 2.3info

• 🔒

CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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