CVE-2025-4919

Severity CVSS v4.0:

Pending analysis

Type:

CWE-125 Out-of-bounds Read

Publication date:

17/05/2025

Last modified:

13/04/2026

Description

An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

Impact

Vector 3.x

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

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

Base Score 3.x

8.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:mozilla:firefox:::::esr:::*		115.23.1 (excluding)
cpe:2.3:a:mozilla:firefox:::::-:::*		138.0.4 (excluding)
cpe:2.3:a:mozilla:firefox:::::esr:::*	116.0 (including)	128.10.1 (excluding)
cpe:2.3:a:mozilla:thunderbird::::::::		128.10.2 (excluding)
cpe:2.3:a:mozilla:thunderbird:::::-:::*	138.0 (including)	138.0.2 (excluding)

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

CVE-2025-4919

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools