CVE-2021-38665: Remote Desktop Protocol Client Information Disclosure Vulnerability

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-10 · updated 2026-08-19

Description

Remote Desktop Protocol Client Information Disclosure Vulnerability

Affected products

Microsoft Remote Desktop client for Windows Desktop: from 1.2.1672 before 1.2.2677 — fixed in 1.2.2677
Microsoft Windows 10 Version 1607: 20h2, 21h1, 1607, 1809, 1909, 2004
Microsoft Windows 11 version 21H2: all versions
Microsoft Windows 7: all versions
Microsoft Windows 8.1: all versions
Microsoft Windows RT 8.1: all versions
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: all versions
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Remote Desktop client for Windows Desktop: from 1.2.0.0 before 1.2.2600 — fixed in 1.2.2600
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19119 — fixed in 10.0.10240.19119
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4770 — fixed in 10.0.14393.4770
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1916 — fixed in 10.0.18363.1916
Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1348 — fixed in 10.0.19042.1348
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1348 — fixed in 10.0.19043.1348
Microsoft Windows 11 21H2: from 10.0.22000.0 before 10.0.22000.318 — fixed in 10.0.22000.318
Microsoft Windows 7: from 6.1.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769
Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769
Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20174 — fixed in 6.3.9600.20174
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.23517 — fixed in 6.2.9200.23517
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20174 — fixed in 6.3.9600.20174
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.4770 — fixed in 10.0.14393.4770
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.350 — fixed in 10.0.20348.350

How to fix

Upgrade to a fixed version: Microsoft Remote Desktop client for Windows Desktop 1.2.2677; Microsoft Remote Desktop client for Windows Desktop 1.2.2600; Microsoft Windows 10 Version 1507 10.0.10240.19119; Microsoft Windows 10 1607 10.0.14393.4770; Microsoft Windows 10 10.0.17763.2300; Microsoft Windows 10 1909 10.0.18363.1916; Microsoft Windows 10 2004 10.0.19041.1348; Microsoft Windows 10 20H2 10.0.19042.1348; Microsoft Windows 10 21H1 10.0.19043.1348; Microsoft Windows 11 21H2 10.0.22000.318; Microsoft Windows 7 6.1.7601.25769; Microsoft Windows 7 Service Pack 1 6.1.7601.25769. Check the vendor advisory for mitigations.

References

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