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CVE-2021-33784

24
FAUCET Score

CVE-2021-33784 is an Elevation of Privilege vulnerability in the Windows Cloud Files Mini Filter Driver, affecting Windows 10, Windows Server 2016, and Windows Server 2019. With a CVSS score of 7.8 (HIGH), this vulnerability allows a local attacker to achieve full compromise (confidentiality, integrity, availability) with low attack complexity and no user interaction required. While it has been patched, there is no public exploit code available (Metasploit, Nuclei, ExploitDB), and it is not listed in CISA's KEV catalog. Community discussion and media coverage are minimal, indicating low public attention.

Impacted Technologies

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

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 83rd percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (20)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for 32-bit SystemsFixed in: 10.0.17763.2061
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 10 Version 1809 for ARM64-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 32-bit SystemsFixed in: 10.0.18363.1679
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 1909 for ARM64-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 21H1 for ARM64-based SystemsFixed in: 10.0.19043.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H1 for 32-bit SystemsFixed in: 10.0.19043.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for 32-bit SystemsFixed in: 10.0.19041.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for ARM64-based SystemsFixed in: 10.0.19041.1110
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 10 Version 20H2 for 32-bit SystemsFixed in: 10.0.19042.1110
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for ARM64-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-2021-33784Important

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Jul 13, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-33784
PatchVendor Advisory