CVE-2021-31956
Windows NTFS Elevation of Privilege Vulnerability
Windows NTFS 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 NTFS Elevation of Privilege Vulnerability
Windows NTFS Elevation of Privilege Vulnerability
- Record
CVE-2021-31956- 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:F/RL:O/RC:C - Weakness
- CWE-191
- Updated
- 2026-11-02
EUVDEUVD-2021-18829
Windows NTFS Elevation of Privilege Vulnerability
- Record
EUVD-2021-18829- 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:F/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jj4q-6c47-cggx
Windows NTFS Elevation of Privilege Vulnerability
Windows NTFS Elevation of Privilege Vulnerability
- Record
GHSA-jj4q-6c47-cggx- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-191, CWE-269
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Windows NTFS Privilege Escalation Vulnerability
Microsoft Windows New Technology File System (NTFS) contains an unspecified vulnerability that allows attackers to escalate privileges via a specially crafted application.
- Record
CVE-2021-31956- Weakness
- CWE-191, CWE-787
- Updated
- 2026-11-02
NVD
Windows NTFS Elevation of Privilege Vulnerability
- Record
CVE-2021-31956- 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 - CVSS 2.0
- 9.3 High
AV:N/AC:M/Au:N/C:C/I:C/A:C - Weakness
- CWE-191
- Updated
- 2026-11-02
Affected products
- microsoft windows
- 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 7
- microsoft windows 7 service pack 1
- microsoft windows 8.1
- microsoft windows server 2008 service pack 2
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- 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 version 2004
- microsoft windows server version 20h2
- microsoft windows 10 1507
- microsoft windows 10 1607
- microsoft windows 10 1809
- microsoft windows 10 1909
- microsoft windows 10 2004
- microsoft windows 10 20h2
- microsoft windows 10 21h1
- microsoft windows rt 8.1
- microsoft windows server 2004
- microsoft windows server 2008
- microsoft windows server 20h2
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | hzshang/CVE-2021-31956 | 2021-11-22 |
| PoC in GitHub | aazhuliang/CVE-2021-31956-EXP | 2022-01-11 |
| PoC in GitHub | Y3A/CVE-2021-31956 | 2022-09-02 |
| PoC in GitHub | hoangprod/CVE-2021-31956-POC | 2023-06-05 |
| PoC in GitHub | DaoshuReal/UAC-Elevation-CVE | 2025-05-07 |
| PoC in GitHub | deletehead/Pool-Overflow-CVE-2021-31956 | 2025-06-17 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31956 is a high vulnerability (CVSS 7.8) in Microsoft Windows, published June 8, 2021. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 22.3%, the 97th percentile. No source names a fixed version.