CVE-2025-0240

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

07/01/2025

Last modified:

13/04/2026

Description

Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 4.00 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x

4.00

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:mozilla:firefox:::::esr:::*		128.6.0 (excluding)
cpe:2.3:a:mozilla:firefox::::::::		134.0 (excluding)
cpe:2.3:a:mozilla:thunderbird::::::::		128.6.0 (excluding)
cpe:2.3:a:mozilla:thunderbird::::::::	129.0 (including)	134.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-0240

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools