CVE-2025-21333HIGH 7.8CISA KEVEPSS p94.9%

CVE-2025-21333Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability

Microsoft / Windows

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.

Scoring

CVSS 3.17.8 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS9.80% probability of exploitation · percentile 94.9% · 2026-06-19T12:03:05Z
Published2025-01-14
Last modified2025-11-03

CISA KEV entry

Added to KEV: 2025-01-14

Underlying weaknesses· 1

CWE-122

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
  2. https://www.exploit-db.com/exploits/52436
  3. https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
  4. https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
  5. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333

1

TypeTargetConfidenceTier
WeaknessHeap-based Buffer Overflowcwe-1220%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerabilitykev-cve-2025-213330%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
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Microsoft Windows Hyper-V Privilege Escalation Vulnerability
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CVE-2026-21255
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CVE-2025-33067
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CVE-2025-48822
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.