CVE-2025-21340
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
Windows Virtualization-Based Security (VBS) Security Feature Bypass 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
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
- Record
CVE-2025-21340- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2025-2405
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
- Record
EUVD-2025-2405- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8g2m-ppjp-6hg7
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
- Record
GHSA-8g2m-ppjp-6hg7- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
Windows Virtualization-Based Security (VBS) Security Feature Bypass Vulnerability
- Record
CVE-2025-21340- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
- microsoft windows 10 version 1809
- 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 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | gduma-phData/patch-CVE-2025-21340 | 2026-08-24 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-21340 is a medium vulnerability (CVSS 5.5) in Microsoft Windows 10 Version 1809, published January 14, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. No source names a fixed version.