CVE Watch—

CVE-2025-21333

Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability

CVSS

—

No CVSS

EPSS

9.8%

p95

KEV

YES

Jan 14, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

9.8%EPSS · 30 days9.8%

2026-06-302026-07-16

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability

Added to KEV

Jan 14, 2025

Remediate by

Feb 4, 2025

Known ransomware use

Summary description

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow vulnerability that allows a local attacker to gain SYSTEM privileges.

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21333

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