CVE-2025-21333
KEVMicrosoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability
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.
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HPublishedJan 14, 2025
Last modifiedJun 17, 2026
Added to KEVJan 14, 2025
Remediation dueFeb 4, 2025
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333PatchVendor Advisory
- exploit-db.com/exploits/52436ExploitThird Party Advisory
- vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-scriptMitigationThird Party Advisory
- vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-scriptMitigationThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333US Government Resource
0 recent articles mention this CVE
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Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 629 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 10.1% · top 4% of all CVEs
- Weakness
- CWE-122
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.