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Windows 10 21h2 CVE-2025-21334

HIGH
Use After Free (CWE-416)
2025-01-14 secure@microsoft.com
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 28, 2026 - 18:03 vuln.today
Patch released
Mar 28, 2026 - 18:03 nvd
Patch available
Added to CISA KEV
Oct 27, 2025 - 17:13 cisa
CISA KEV
CVE Published
Jan 14, 2025 - 18:15 nvd
HIGH 7.8

DescriptionCVE.org

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

AnalysisAI

Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability allowing local privilege escalation, the second of three Hyper-V zero-days in January 2025.

Technical ContextAI

The CWE-416 use-after-free in the VSP component allows accessing freed memory during Hyper-V service operations, enabling privilege escalation.

RemediationAI

Apply January 2025 security updates. All three Hyper-V CVEs must be patched simultaneously.

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CVE-2025-21334 vulnerability details – vuln.today

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