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CVE-2021-38666— Remote Desktop Client Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Remote Desktop client for Windows Desktop
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows rdp是美国微软（Microsoft）公司的一款用于连接远程Windows桌面的应用。 Microsoft Windows RDP存在代码注入漏洞。以下产品和版本受到影响：Windows 10 Version 20H2 for ARM64-based Systems,Windows Server, version 20H2 (Server Core Installation),Windows 11 for x64-based Systems,Windows 11 for

CVSS 8.8 · High EPSS 15.06% · P97

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 28

VendorProduct Version RangeStatus
Microsoft Remote Desktop client for Windows Desktop - affected
Microsoft Windows 10 Version 1507 10.0.10240.0< 10.0.10240.19119 affected
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.4770 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.2300 affected
10.0.0< 10.0.17763.2300 affected
Microsoft Windows 10 Version 1909 10.0.0< 10.0.18363.1916 affected
Microsoft Windows 10 Version 2004 10.0.0< 10.0.19041.1348 affected
Microsoft Windows 10 Version 20H2 10.0.0< 10.0.19042.1348 affected
Microsoft Windows 10 Version 21H1 10.0.0< 10.0.19043.1348 affected
Microsoft Windows 11 version 21H2 10.0.22000.0< 10.0.22000.318 affected
Microsoft Windows 7 6.1.0< 6.1.7601.25769 affected
Microsoft Windows 7 Service Pack 1 6.1.0< 6.1.7601.25769 affected
Microsoft Windows 8.1 6.3.0< 6.3.9600.20174 affected
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0< 6.1.7601.25769 affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0< 6.1.7601.25769 affected
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0< 6.0.6003.21282 affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0< 6.0.6003.21282 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.23517 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.23517 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.20174 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.20174 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.4770 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.4770 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.2300 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.2300 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.350 affected
Microsoft Windows Server version 2004 10.0.0< 10.0.19041.1348 affected
Microsoft Windows Server version 20H2 10.0.0< 10.0.19041.1348 affected
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I. Basic Information for CVE-2021-38666

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Remote Desktop Client Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Remote Desktop Client Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows rdp 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows rdp是美国微软（Microsoft）公司的一款用于连接远程Windows桌面的应用。 Microsoft Windows RDP存在代码注入漏洞。以下产品和版本受到影响：Windows 10 Version 20H2 for ARM64-based Systems,Windows Server, version 20H2 (Server Core Installation),Windows 11 for x64-based Systems,Windows 11 for
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Remote Desktop client for Windows Desktop - -
Microsoft Windows 10 Version 1507 10.0.10240.0 ~ 10.0.10240.19119 -
Microsoft Windows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.4770 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.2300 -
Microsoft Windows 10 Version 1809 10.0.0 ~ 10.0.17763.2300 -
Microsoft Windows 10 Version 1909 10.0.0 ~ 10.0.18363.1916 -
Microsoft Windows 10 Version 2004 10.0.0 ~ 10.0.19041.1348 -
Microsoft Windows 10 Version 20H2 10.0.0 ~ 10.0.19042.1348 -
Microsoft Windows 10 Version 21H1 10.0.0 ~ 10.0.19043.1348 -
Microsoft Windows 11 version 21H2 10.0.22000.0 ~ 10.0.22000.318 -
Microsoft Windows 7 6.1.0 ~ 6.1.7601.25769 -
Microsoft Windows 7 Service Pack 1 6.1.0 ~ 6.1.7601.25769 -
Microsoft Windows 8.1 6.3.0 ~ 6.3.9600.20174 -
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.25769 -
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.25769 -
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.21282 -
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.21282 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.23517 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.23517 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.20174 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.20174 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.4770 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.4770 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.2300 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.2300 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.350 -
Microsoft Windows Server version 2004 10.0.0 ~ 10.0.19041.1348 -
Microsoft Windows Server version 20H2 10.0.0 ~ 10.0.19041.1348 -

II. Public POCs for CVE-2021-38666

# POC Description Source Link Shenlong Link
1 None https://github.com/DarkSprings/CVE-2021-38666-poc POC Details
2 RDP Client RCE https://github.com/JaneMandy/CVE-2021-38666 POC Details
3 RDP Client RCE https://github.com/ImuSpirit/CVE-2021-38666 POC Details
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III. Intelligence Information for CVE-2021-38666

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Vendor Advisories for CVE-2021-38666 (2)

Same Patch Batch · Microsoft · 2021-11-10 · 54 CVEs total

CVE-2021-26443 9.0 CRITICAL Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability
CVE-2021-42321 8.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-42316 8.8 HIGH Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2021-42283 8.8 HIGH NTFS Elevation of Privilege Vulnerability
CVE-2021-42275 8.8 HIGH Microsoft COM for Windows Remote Code Execution Vulnerability
CVE-2021-43209 7.8 HIGH 3D Viewer Remote Code Execution Vulnerability
CVE-2021-43208 7.8 HIGH 3D Viewer Remote Code Execution Vulnerability
CVE-2021-42296 7.8 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2021-42298 7.8 HIGH Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-42292 7.8 HIGH Microsoft Excel Security Feature Bypass Vulnerability
CVE-2021-42286 7.8 HIGH Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege
CVE-2021-42285 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-42276 7.8 HIGH Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-41378 7.8 HIGH Windows NTFS Remote Code Execution Vulnerability
CVE-2021-41377 7.8 HIGH Windows Fast FAT File System Driver Elevation of Privilege Vulnerability
CVE-2021-41370 7.8 HIGH NTFS Elevation of Privilege Vulnerability
CVE-2021-41367 7.8 HIGH NTFS Elevation of Privilege Vulnerability
CVE-2021-41366 7.8 HIGH Credential Security Support Provider Protocol (CredSSP) Elevation of Privilege Vulnerabili
CVE-2021-40442 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-36957 7.8 HIGH Windows Desktop Bridge Elevation of Privilege Vulnerability

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Remote Desktop client for Windows Desktop
Same vendor: Microsoft

V. Comments for CVE-2021-38666

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