CVE-2025-21333
HIGH
2025-01-14
[email protected]
7.8
CVSS 3.1
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CVSS Vector
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
5
Analysis Generated
Mar 28, 2026 - 18:03 vuln.today
Patch Released
Mar 28, 2026 - 18:03 nvd
Patch available
Added to CISA KEV
Nov 03, 2025 - 15:08 cisa
CISA KEV
PoC Detected
Nov 03, 2025 - 15:08 vuln.today
Public exploit code
CVE Published
Jan 14, 2025 - 18:15 nvd
HIGH 7.8
Tags
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Analysis
Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow allowing authorized local attackers to escalate privileges, one of three Hyper-V zero-days exploited in January 2025 Patch Tuesday.
Technical Context
The CWE-122 heap overflow in the VSP (Virtual Service Provider) component of Hyper-V's NT Kernel Integration allows local attackers to corrupt heap memory and escalate privileges from guest VM or local user context.
Affected Products
['Microsoft Windows with Hyper-V enabled']
Remediation
Apply January 2025 Patch Tuesday updates. Monitor Hyper-V hosts for anomalous behavior. Consider isolating high-security workloads on dedicated hosts.
Priority Score
191
Low
Medium
High
Critical
KEV: +50
EPSS: +81.8
CVSS: +39
POC: +20
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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