CVE-2026-61921: Windows Remote Desktop Client Information Disclosure Vulnerability

mediumCVSS 6.5CVE-2026-61921

Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoft product: Remote Desktop Client Information disclosure Memory corruption

What: Out-of-bounds read in Remote Desktop Client allows disclosure of sensitive information over the network.
Who is affected: Systems running Remote Desktop Client connecting to untrusted servers.
Urgency: Medium severity; information disclosure over network warrants timely patching.
Action: Update Remote Desktop Client to the latest version via Windows Update.

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: medium — CVSS 6.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61921

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.

Low exploitation riskCVE-2026-619210.83% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-61921	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
mediumCVE-2026-61921: Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose inform…nvd

Recent advisories for Windows Remote Desktop

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.

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highCVE-2026-61356: Missing authentication for critical function in Windows Remote Desktop Services allows an auth…nvd · 2026-08-11
highCVE-2026-61364: Windows Remote Desktop Services Elevation of Privilege Vulnerabilitymsrc · 2026-08-11