High 7.8Known exploited (CISA KEV)Published Jan 14, 2025

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

Updated under an hour ago (Oct 26, 2026, 11:30 PM ET)

Does this affect you?

It affects Microsoft Windows 10 Version 21H2 and 7 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jan 14, 2025; federal agencies had to remediate by Feb 4, 2025. Treat that date as your deadline.

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Every CVE for Microsoft Windows 10 Version 21H2

Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness (CWE): CWE-122
Known exploited: Added to CISA KEV Jan 14, 2025; federal remediation due Feb 4, 2025Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 10.07% (percentile 96)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Jun 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2	from 10.0.19044.0 before 10.0.19044.5371	CNA record
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2	from 10.0.19045.0 before 10.0.19045.5371	CNA record
Microsoft Windows 11 version 22H2 microsoft:windows_11_22h2	from 10.0.22621.0 before 10.0.22621.4751	CNA record
Microsoft Windows 11 version 22H3 microsoft:windows_11_22h3	from 10.0.22631.0 before 10.0.22631.4751	CNA record
Microsoft Windows 11 Version 23H2 microsoft:windows_11_23h2	from 10.0.22631.0 before 10.0.22631.4751	CNA record
Microsoft Windows 11 Version 24H2 microsoft:windows_11_24h2	from 10.0.26100.0 before 10.0.26100.2894	CNA record
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) microsoft:windows_server_2022_23h2	from 10.0.25398.0 before 10.0.25398.1369	CNA record
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name)	from 10.0.26100.0 before 10.0.26100.2894	CNA record
microsoft windows_10_21h2 microsoft:windows_10_21h2	before 10.0.19044.5371	NVD
microsoft windows_10_22h2 microsoft:windows_10_22h2	before 10.0.19045.5371	NVD
1–10 of 15

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333	vendor-advisory, patch
https://www.exploit-db.com/exploits/52436	exploit, third-party-advisory, vdb-entry
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script	mitigation, third-party-advisory
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script	mitigation, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.