CVE-2021-33744
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
- Record
CVE-2021-33744- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-20421
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
- Record
EUVD-2021-20421- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6qxh-x657-496f
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
- Record
GHSA-6qxh-x657-496f- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
NVD
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
- Record
CVE-2021-33744- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N - CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.2 High
AV:L/AC:L/Au:N/C:C/I:C/A:C - Updated
- 2026-11-02
Affected products
- microsoft windows 10 version 1809
- microsoft windows 10 version 1909
- microsoft windows 10 version 2004
- microsoft windows 10 version 21h1
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server version 2004
- microsoft windows server version 20h2
- microsoft windows 10
- microsoft windows server 2016
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33744 is a medium vulnerability (CVSS 5.3) in Microsoft Windows 10 Version 1809, published July 14, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.79%, the 56th percentile. No source names a fixed version.