Mozilla Firefox up to 135 memory corruption

Summaryinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 135. The affected element is an unknown function. The manipulation results in memory corruption. This vulnerability is cataloged as CVE-2025-1938. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 135. Affected is some unknown functionality. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. 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 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is traded as CVE-2025-1938 since 03/04/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 04/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 232115 (Linux Distros Unpatched Vulnerability : CVE-2025-1938), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 136 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (232115). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 135

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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