CVE-2026-42913 Microsoft CVE debrief

Who should care

Organizations and individuals using Microsoft Remote Desktop Client and affected Windows versions should prioritize patching to prevent potential code execution attacks.

Technical summary

The vulnerability is a heap-based buffer overflow in Remote Desktop Client, enabling unauthorized attackers to execute code over a network. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating a high severity. Affected configurations include cpe:2.3:a:microsoft:remote_desktop_client:*:*:*:*:*:windows:*:* and various Windows 11 and Windows Server versions.

Defensive priority

High

Recommended defensive actions

• Apply patches from Microsoft for Remote Desktop Client and affected Windows versions
• Restrict access to Remote Desktop Client to trusted users only
• Implement network segmentation to limit lateral movement
• Monitor Remote Desktop Client usage for suspicious activity
• Use secure communication protocols for Remote Desktop connections
• Regularly update and patch Remote Desktop Client and Windows versions
• Consider using alternative remote access solutions with built-in security features

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and Microsoft's security advisories. The CVE record and NVD detail pages were accessed on 2026-06-17.

Official resources