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CVE-2025-1942

critical

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 was fixed in Firefox 136 and Thunderbird 136.

References

https://www.mozilla.org/security/advisories/mfsa2025-17/

https://www.mozilla.org/security/advisories/mfsa2025-14/

https://bugzilla.mozilla.org/show_bug.cgi?id=1947139

Details

Source: Mitre, NVD

Published: 2025-03-04

Updated: 2026-04-13

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00025