Heap-based Buffer Overflow Vulnerability in Microsoft Remote Desktop Client
CVE-2026-42993

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 21h2
Windows 10 Version 22h2
Windows 11 Version 23h2
Windows 11 Version 23h2
Vendor
CVE Published:
9 June 2026

What is CVE-2026-42993?

A heap-based buffer overflow exists in Microsoft Remote Desktop Client, enabling an unauthorized attacker to execute arbitrary code over a network. This vulnerability arises due to improper handling of memory within the application, allowing attackers to craft malicious requests that could lead to code execution on the targeted system. Users are advised to apply the necessary patches to safeguard their systems and mitigate the risk associated with this vulnerability.

Affected Version(s)

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7417

Windows 10 Version 22H2 32-bit Systems 10.0.19045.0 < 10.0.19045.7417

Windows 11 version 23H2 ARM64-based Systems 10.0.22631.0 < 10.0.22631.7219

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

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