CVE-2025-21333

unknown KEV

Published 2025-01-14 · Modified 2025-01-14

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

2.5

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.

CISA KEV

Vendor: Microsoft
Product: Windows
Due date: 2025-02-04

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-52436 local windows

Milad Karimi (Ex3ptionaL) · 2025-09-16

Microsoft Windows Server 2025 Hyper-V NT Kernel Integration VSP - Elevation of Privilege

Source code queued for fetch — refresh in a moment.

References

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

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.