CVE-2025-21333
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- Record
CVE-2025-21333- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2025-2398
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- Record
EUVD-2025-2398- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-gjv6-pfh4-3rff
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- Record
GHSA-gjv6-pfh4-3rff- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow vulnerability that allows a local attacker to gain SYSTEM privileges.
- Record
CVE-2025-21333- Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- Record
CVE-2025-21333- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
Affected products
- microsoft windows
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 22h2
- microsoft windows 11 version 22h3
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 10 21h2
- microsoft windows 10 22h2
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | MrAle98/CVE-2025-21333-POC | 2025-02-27 |
| PoC in GitHub | aleongx/KQL_sentinel_CVE-2025-21333 | 2025-03-11 |
| Exploit-DB | Microsoft Windows Server 2025 Hyper-V NT Kernel Integration VSP - Elevation of Privilege | 2025-09-16 |
| PoC in GitHub | nu1lptr0/CVE-2025-21333 | 2026-05-05 |
| PoC in GitHub | uname1able/CVE-2025-21333 | 2026-07-16 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, Exploit-DB, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-21333 is a high vulnerability (CVSS 7.8) in Microsoft Windows, published January 14, 2025. CISA lists it as known to be exploited, since January 14, 2025. EUVD reports exploitation since January 14, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 10.1%, the 95th percentile. No source names a fixed version.
References
msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333
vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
exploit-db.com/exploits/52436
nvd.nist.gov/vuln/detail/CVE-2025-21333
github.com/advisories/GHSA-gjv6-pfh4-3rff