CVE-2025-21333
What it is
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- 2025-01-14 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- PublishedDisclosed publicly on CVE.org and NVD
- 2025-02-04 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 10.1% in the next 30 days (EPSS).
- Severity: 7.8 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2025-01-14
- Exploit probability
- 10.1% · EPSS, next 30 days
- Weakness
- CWE-122
- Record status
- Analyzed
Affected
- Microsoft Windows 10 21h2 < 10.0.19044.5371
- Microsoft Windows 10 22h2 < 10.0.19045.5371
- Microsoft Windows 11 22h2 < 10.0.22621.4751
- Microsoft Windows 11 23h2 < 10.0.22631.4751
- Microsoft Windows 11 24h2 < 10.0.26100.2894
- Microsoft Windows Server 2022 23h2 < 10.0.25398.1369
- Microsoft Windows Server 2025 < 10.0.26100.2894
Attack profile CVSS 3.1 · 7.8
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2025-21333.md and follow it. Check whether this project is affected by CVE-2025-21333. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
- https://www.exploit-db.com/exploits/52436
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333