CVE-2026-42993

HIGH

Microsoft Windows 10 Version 21H2 - Remote Desktop Client Remote Code Execution Vulnerability

Title source: rule
STIX 2.1

Description

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Remote Desktop Client Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42993

Scores

CVSS v3 7.5
EPSS 0.0034
EPSS Percentile 25.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-122
Status published
Products (17)
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.7417
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.7417
Microsoft/Windows 11 version 23H2 10.0.22631.0 - 10.0.22631.7219
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8655
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8655
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2269
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.5256
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32995
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32995
microsoft/windows_10_21h2 < 10.0.19044.7417 (3 CPE variants)
... and 7 more
Published Jun 09, 2026
Tracked Since Jun 09, 2026