#VU105324 Information disclosure in Mozilla Firefox and Firefox for Android - CVE-2025-1942

Vulnerability identifier: #VU105324

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-1942

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application within the String.toUpperCase() function, which includes parts of uninitialized memory into the result output. A remote attacker can gain unauthorized access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 130.0 - 135.0.1

Firefox for Android: 130.0 - 135.0.1

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2025-14/
https://bugzilla.mozilla.org/show_bug.cgi?id=1947139

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.