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CVE-2025-21333: Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-01-14
• EPSS: 10.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-01-14 · updated 2026-06-17
• Weakness: CWE-122

Description

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10: before 10.0.19044.5371 — fixed in 10.0.19044.5371
• Microsoft Windows 10: before 10.0.19045.5371 — fixed in 10.0.19045.5371
• Microsoft Windows 11: before 10.0.22621.4751 — fixed in 10.0.22621.4751
• Microsoft Windows 11: before 10.0.22631.4751 — fixed in 10.0.22631.4751
• Microsoft Windows 11: before 10.0.26100.2894 — fixed in 10.0.26100.2894
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1369 — fixed in 10.0.25398.1369
• Microsoft Windows Server 2025: before 10.0.26100.2894 — fixed in 10.0.26100.2894
• Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.5371 — fixed in 10.0.19044.5371
• Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.5371 — fixed in 10.0.19045.5371
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.4751 — fixed in 10.0.22621.4751
• Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.4751 — fixed in 10.0.22631.4751
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.4751 — fixed in 10.0.22631.4751
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.2894 — fixed in 10.0.26100.2894
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1369 — fixed in 10.0.25398.1369
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.2894 — fixed in 10.0.26100.2894

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.19044.5371; Microsoft Windows 10 10.0.19045.5371; Microsoft Windows 11 10.0.22621.4751; Microsoft Windows 11 10.0.22631.4751; Microsoft Windows 11 10.0.26100.2894; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1369; Microsoft Windows Server 2025 10.0.26100.2894; Microsoft Windows 10 10.0.19044.5371; Microsoft Windows 10 10.0.19045.5371; Microsoft Windows 11 10.0.22621.4751; Microsoft Windows 11 version 22H3 10.0.22631.4751; Microsoft Windows 11 10.0.22631.4751. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
• https://www.exploit-db.com/exploits/52436
• https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
• https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333

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