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CVE-2026-42913 Microsoft CVE debrief

CVE-2026-42913 is a high-severity vulnerability in Microsoft Remote Desktop Client, allowing unauthorized attackers to execute code over a network via a heap-based buffer overflow. The vulnerability has a CVSS score of 7.5 and is considered HIGH. It was published on 2026-06-09 and last modified on 2026-06-17. Affected products include Remote Desktop Client and various Windows versions. Users should apply patches immediately to prevent potential attacks.

Vendor
Microsoft
Product
Remote Desktop Client
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-09
Advisory published
2026-06-09
Advisory updated
2026-07-09

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42913 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42913

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42913 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42913

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.