Live › vulnerability › CVE-2025-21333
Go to dashboardA heap-based buffer overflow in the Windows Hyper-V NT Kernel Integration VSP lets a local attacker escalate to SYSTEM privileges. It is listed in CISA's Known Exploited Vulnerabilities catalog, so it is being used in real attacks.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Windows | vendor | – | – |
| microsoft windows 10 21h2 | vendor | < 10.0.19044.5371 | 10.0.19044.5371 |
| microsoft windows 10 22h2 | vendor | < 10.0.19045.5371 | 10.0.19045.5371 |
| microsoft windows 11 22h2 | vendor | < 10.0.22621.4751 | 10.0.22621.4751 |
| microsoft windows 11 23h2 | vendor | < 10.0.22631.4751 | 10.0.22631.4751 |
| microsoft windows 11 24h2 | vendor | < 10.0.26100.2894 | 10.0.26100.2894 |
| microsoft windows server 2022 23h2 | vendor | < 10.0.25398.1369 | 10.0.25398.1369 |
| microsoft windows server 2025 | vendor | < 10.0.26100.2894 | 10.0.26100.2894 |
Unknown from the sources.
Apply the Microsoft security update for CVE-2025-21333 per vendor instructions, or discontinue use of the product if mitigations are unavailable.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow vulnerability that allows a local attacker to gain SYSTEM privileges.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
This page as .md · .json · in your agent: get_signal("CVE-2025-21333")
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