What is CVE-2025-21340?

CVE-2025-21340 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability

Which CVE IDs does CVE-2025-21340 cover?

CVE-2025-21340 covers the following CVE IDs: CVE-2025-21340. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-21340?

CVE-2025-21340 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-21340?

CVE-2025-21340 affects 21 products, including: Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows 10 Version 21H2 for 32-bit Systems; Windows 10 Version 21H2 for ARM64-based Systems; Windows 10 Version 21H2 for x64-based Systems; and others — see the full list on the advisory page.

CVE-2025-21340HighCVSS 5.5

Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

January 14, 2025

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2025-21340 →

📋 Description

Are there any additional steps that I need to follow to be protected from this vulnerability? The changes to address this vulnerability updated Virtual Secure Mode components. The policy described in Guidance for blocking rollback of Virtualization-based Security (VBS) related security updates has been updated to account for the latest changes. If you deployed this policy, then you'll need to redeploy using the updated policy.

🎯 Affected products21

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 22H2 for ARM64-based Systems
Windows 11 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5050008 (Security Update) — fixed build 10.0.17763.6775 KB5049983 (Security Update) — fixed build 10.0.20348.3091 KB5049981 (Security Update) — fixed build 10.0.19044.5371 KB5050021 (Security Update) — fixed build 10.0.22621.4751 KB5049981 (Security Update) — fixed build 10.0.19045.5371 KB5050009 (Security Update) — fixed build 10.0.26100.2894 KB5050021 (Security Update) — fixed build 10.0.22631.4751 KB5049984 (Security Update) — fixed build 10.0.25398.1369

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products21

✅ Remediation

🔗 References (13)