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CVE-2026-42985 Microsoft CVE debrief

CVE-2026-42985 is a high-severity vulnerability in the Remote Desktop Client that allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is classified as HIGH. It was published on 2026-06-09T17:17:14.500Z and modified on 2026-06-15T20:15:51.050Z.

Vendor
Microsoft
Product
Remote Desktop client for Windows Desktop
CVSS
HIGH 8.8
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

Administrators and users of Microsoft Remote Desktop Client and affected Windows versions should be aware of this vulnerability.

Technical summary

The vulnerability is a heap-based buffer overflow in the Remote Desktop Client, which allows an attacker to execute code over a network. The Common Vulnerabilities and Exposures (CVE) score is 8.8, indicating a high severity. The vulnerability affects multiple versions of Windows and Remote Desktop Client.

Defensive priority

High

Recommended defensive actions

  • Apply patches and updates from Microsoft as soon as possible.
  • Use secure communication protocols and limit access to the Remote Desktop Client.
  • Monitor for suspicious activity and implement additional security measures to prevent exploitation.

Evidence notes

The vulnerability is confirmed by Microsoft and has been analyzed by the National Vulnerability Database (NVD).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42985 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42985

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

  • CVE-2026-42985 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42985

    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.