CVE-2025-21333

Name: CVE-2025-21333
Creator: NVD / NIST
Published: 2025-01-14T18:15:58.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 9.72%

Last modified Jun 17, 2026

CVE-2025-21333 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 9.72% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

9.72%

94.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Feb 4, 2025.

Weakness Enumeration

CWE-122

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10 21h2	< 10.0.19044.5371
Microsoft	Windows 10 22h2	< 10.0.19045.5371
Microsoft	Windows 11 22h2	< 10.0.22621.4751
Microsoft	Windows 11 23h2	< 10.0.22631.4751
Microsoft	Windows 11 24h2	< 10.0.26100.2894
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1369
Microsoft	Windows Server 2025	< 10.0.26100.2894

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333Patch, Vendor Advisory
https://www.exploit-db.com/exploits/52436Exploit, Third Party Advisory, VDB Entry
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-scriptMitigation, Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-scriptMitigation, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333US Government Resource

Timeline

Published: Jan 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21333?

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

How severe is CVE-2025-21333?

CVE-2025-21333 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 9.72% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-21333?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21333?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST