CVE-2025-4091

Severity CVSS v4.0:

Pending analysis

Type:

CWE-119 Buffer Errors

Publication date:

29/04/2025

Last modified:

13/04/2026

Description

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

Impact

Vector 3.x

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

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x

8.10

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:mozilla:firefox:::::esr:::*		128.10 (excluding)
cpe:2.3:a:mozilla:firefox:::::-:::*		138.0 (excluding)
cpe:2.3:a:mozilla:thunderbird:::::esr:::*		128.10.0 (excluding)
cpe:2.3:a:mozilla:thunderbird:::::-:::*		138.0 (excluding)

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

CVE-2025-4091

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools