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CVE-2021-1669

28
FAUCET Score

CVE-2021-1669 is a Windows Remote Desktop Security Feature Bypass Vulnerability affecting Microsoft Remote Desktop, Remote Desktop Client, Windows 10, Windows Server 2016, and Windows Server 2019. It carries a high CVSS score of 8.8, indicating a network-exploitable vulnerability with low attack complexity that could lead to high confidentiality, integrity, and availability impacts. While there is no evidence of active exploitation or publicly available exploit code, the vulnerability has garnered significant community discussion and media coverage, suggesting notable attention from security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:remote_desktop:-:*:*:*:*:-:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:remote_desktop:-:*:*:*:*:android:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:remote_desktop_client:-:*:*:*:*:windows:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
20h2CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.97%
Probability of exploitation in next 30 days
EPSS Percentile
85.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0297 is in the 84th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 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 (27)

microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for ARM64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server, version 20H2 (Server Core Installation)
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for ARM64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server, version 2004 (Server Core installation)
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1803 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1803 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1803 for ARM64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for ARM64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for ARM64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server, version 1909 (Server Core installation)
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016 (Server Core installation)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Remote Desktop for Mac
View patch
microsoftpatch availablevia msrc
Product: Microsoft Remote Desktop for IoS
View patch
microsoftpatch availablevia msrc
Product: Remote Desktop client for Windows Desktop
View patch

Vendor Advisories (1)

microsoft2021-Jan/CVE-2021-1669Important

Windows Remote Desktop Security Feature Bypass Vulnerability

Jan 12, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-1669
msrc.microsoft.com / update-guide/vulnerability/CVE-2021-1669