Memory Exposure Vulnerability in Mozilla Firefox Browser
CVE-2025-1942

9.8CRITICAL

Key Information:

Vendor
Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
4 March 2025

Summary

This vulnerability arises in Mozilla Firefox due to improper handling of string operations. Specifically, when the String.toUpperCase() method is applied to a string that unexpectedly increases in length, it can inadvertently incorporate uninitialized memory into the resulting string. This flaw poses potential risks as sensitive information may be leaked, posing privacy concerns for users. It is recommended to update to the latest version of Firefox to mitigate the effects of this vulnerability.

Affected Version(s)

Firefox < 136

Thunderbird < 136

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1947139
https://www.mozilla.org/security/advisories/mfsa2025-14/
https://www.mozilla.org/security/advisories/mfsa2025-17/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

anbu
.