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CVE-2026-42913: Remote Desktop Client Remote Code Execution Vulnerability

highCVSS 7.5CVE-2026-42913
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Remote Desktop ClientRemote code execution
What
A heap-based buffer overflow in Remote Desktop Client allows unauthorized code execution over a network.
Who is affected
Users of Remote Desktop Client are affected.
Urgency
High urgency due to the severity of remote code execution risk, with no current exploitation reported.
Action
Update to the latest version of Remote Desktop Client immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42913

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42913coverage & exploitation statusNVD · CVE.org

Recent advisories for Remote Desktop Client

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center