Heap-based Buffer Overflow in Microsoft Remote Desktop Client
CVE-2026-42909

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Remote Desktop Client For Windows Desktop
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Vendor
CVE Published:
9 June 2026

What is CVE-2026-42909?

A heap-based buffer overflow in Microsoft Remote Desktop Client enables unauthorized attackers to potentially execute arbitrary code through specially crafted commands sent over a network. This flaw poses a significant risk to users, allowing for unauthorized access to data and system control, reinforcing the need for timely patching and security measures.

Affected Version(s)

Remote Desktop client for Windows Desktop 1.2.0.0 < 1.2.7214.0

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9234

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8880

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.