Windows
CVE-2025-21333
HIGH
Severity by source
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
Lifecycle Timeline
5DescriptionCVE.org
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
AnalysisAI
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 ContextAI
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.
RemediationAI
Apply January 2025 Patch Tuesday updates. Monitor Hyper-V hosts for anomalous behavior. Consider isolating high-security workloads on dedicated hosts.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today