CVE-2025-21335
HIGH
2025-01-14
[email protected]
7.8
CVSS 3.1
Share
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
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
Tags
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Analysis
Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability for local privilege escalation, the third of three Hyper-V zero-days exploited in January 2025.
Technical Context
The CWE-416 use-after-free provides a third exploitation path through the Hyper-V VSP, reinforcing the systematic nature of the attack against Hyper-V's kernel integration layer.
Affected Products
['Microsoft Windows with Hyper-V enabled']
Remediation
Apply January 2025 security updates for all three Hyper-V CVEs.
Priority Score
98
Low
Medium
High
Critical
KEV: +50
EPSS: +8.7
CVSS: +39
POC: 0
Share
External POC / Exploit Code
Leaving vuln.today
Destination URL
POC code from unknown sources may be malicious, contain backdoors, or be fake.
Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).