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CVE-2021-33744

22
FAUCET Score

CVE-2021-33744 is a Windows Secure Kernel Mode Security Feature Bypass Vulnerability affecting Windows 10, Windows Server 2016, and Windows Server 2019. With a CVSS score of 6.7 (Medium), this vulnerability allows a high-privileged attacker with local access to achieve high impact on confidentiality, integrity, and availability. There is no public exploit code available, nor is it listed in CISA's KEV catalog, indicating it is not currently under active exploitation. Despite limited community discussion, it received media coverage during Microsoft's July 2021 Patch Tuesday.

Impacted Technologies

VendorProductVersion(s)CPE
20h2CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x64:*
21h1CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x64:*
1809CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:x64:*
1909CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:x64:*
2004CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x64:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
0.8
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.65%
Probability of exploitation in next 30 days
EPSS Percentile
47.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0065 is in the 94th percentile among its peer group of 3,720 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (10)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for x64-based SystemsFixed in: 10.0.17763.2061
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019Fixed in: 10.0.17763.2061
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019 (Server Core installation)Fixed in: 10.0.17763.2061
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for x64-based SystemsFixed in: 10.0.18363.1679
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H1 for x64-based SystemsFixed in: 10.0.19043.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for x64-based SystemsFixed in: 10.0.19041.1110
View patch
microsoftpatch availablevia msrc
Product: Windows Server, version 2004 (Server Core installation)Fixed in: 10.0.19041.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for x64-based SystemsFixed in: 10.0.19042.1110
View patch
microsoftpatch availablevia msrc
Product: Windows Server, version 20H2 (Server Core Installation)Fixed in: 10.0.19042.1110
View patch

Vendor Advisories (1)

microsoft2021-Jul/CVE-2021-33744Important

Windows Secure Kernel Mode Security Feature Bypass Vulnerability

Jul 13, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-33744
PatchVendor Advisory