CVE-2025-1942

9.8 CRITICAL

Published: March 04, 2025 Modified: April 13, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

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

Source: security@mozilla.org

Issue Tracking

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

Source: security@mozilla.org

Vendor Advisory

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

Source: security@mozilla.org

Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

0.5%

64th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-908

Affected Vendors

mozilla

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