CVE-2021-43893
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- 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 Encrypting File System (EFS) Elevation of Privilege Vulnerability
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
- Record
CVE-2021-43893- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-30755
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
- Record
EUVD-2021-30755- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jx9r-hrmg-9q76
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
- Record
GHSA-jx9r-hrmg-9q76- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
NVD
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
- Record
CVE-2021-43893- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.0 Medium
AV:N/AC:M/Au:S/C:P/I:P/A:P - Weakness
- CWE-668
- Updated
- 2026-11-02
Affected products
- microsoft windows 10 version 1507
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 1909
- microsoft windows 10 version 2004
- microsoft windows 10 version 20h2
- microsoft windows 10 version 21h1
- microsoft windows 10 version 21h2
- microsoft windows 11 version 21h2
- microsoft windows 7
- microsoft windows 7 service pack 1
- microsoft windows 8.1
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- microsoft windows server 2008 service pack 2
- microsoft windows server 2008 r2 service pack 1
- microsoft windows server 2008 r2 service pack 1 (server core installation)
- microsoft windows server 2008 service pack 2
- microsoft windows server 2008 service pack 2 (server core installation)
- microsoft windows server 2012
- microsoft windows server 2012 (server core installation)
- microsoft windows server 2012 r2
- microsoft windows server 2012 r2 (server core installation)
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server version 2004
- microsoft windows server version 20h2
- microsoft windows 10
- microsoft windows 11
- microsoft windows rt 8.1
- microsoft windows server
- microsoft windows server 2008
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | jbaines-r7/blankspace | 2022-02-04 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43893 is a high vulnerability (CVSS 7.5) in Microsoft Windows 10 Version 1507, published December 15, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 6.72%, the 93rd percentile. No source names a fixed version.