CVE-2025-1942

CRITICAL

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/4/2025

Last Modified4/13/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mozilla:firefoxmozilla:thunderbird

Weaknesses (CWE)

CWE-908

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1947139(security@mozilla.org)

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

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

IOC Correlations

No correlations recorded

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