Cross-Site Scripting Vulnerability in Mozilla Firefox and Thunderbird
CVE-2025-0240

4MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
7 January 2025

What is CVE-2025-0240?

A potential security vulnerability exists in Mozilla Firefox and Thunderbird where parsing a JavaScript module as JSON may cause cross-compartment access. This flaw can lead to a use-after-free condition, creating risks for users of affected versions. Specifically, versions of Firefox prior to 134, Firefox ESR prior to 128.6, and Thunderbird versions prior to 134 and 128.6 are vulnerable. Users are urged to update their software promptly to mitigate potential risks.

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Affected Version(s)

Firefox < 134

Firefox ESR < 128.6

Thunderbird < 134

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1929623
https://www.mozilla.org/security/advisories/mfsa2025-01/
https://www.mozilla.org/security/advisories/mfsa2025-02/

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

Credit

Nils Bars
JSON
.