CyberAlerts is shutting down on June 30th, 2025. Thank you for your support!

CVE-2025-1942: When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string This...

Description

When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string This vulnerability affects Firefox < 136.

Classification

CVE ID: CVE-2025-1942

Problem Types

Disclosure of uninitialized memory when .toUpperCase() causes string to get longer

Affected Products

Vendor: Mozilla

Product: Firefox

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.09% (probability of being exploited)

EPSS Percentile: 22.47% (scored less or equal to compared to others)

EPSS Date: 2025-04-02 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-1942
https://bugzilla.mozilla.org/show_bug.cgi?id=1947139
https://www.mozilla.org/security/advisories/mfsa2025-14/

Timeline