CVE-2025-21399

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

7.4 High

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.68%Up 0.6 points since Jan 18, 2025

What each source reports

CVE List Score used 7.4

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Record: CVE-2025-21399
CVSS 3.1: 7.4 HighCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness: CWE-426
Updated: 2026-11-02

EUVDEUVD-2025-2459 7.4

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Record: EUVD-2025-2459
CVSS 3.1: 7.4 HighCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Updated: 2026-11-02

GitHub AdvisoriesGHSA-78xr-cmr3-fxq9 7.4

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Record: GHSA-78xr-cmr3-fxq9
CVSS 3.1: 7.4 HighCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-273, CWE-426
Updated: 2026-11-02

NVD 7.4

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Record: CVE-2025-21399
CVSS 3.1: 7.4 HighCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-426
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-21399 is a high vulnerability (CVSS 7.4) in Microsoft Edge Update, published January 17, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.68%, the 52nd percentile. No source names a fixed version.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

History

In short

References