CVE-2026-45639: Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability

highCVSS 7.5CVE-2026-45639

Out-of-bounds read in Windows RDP allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoft product: Windows RDP Information disclosure

What: An out-of-bounds read in Windows RDP allows unauthorized information disclosure over a network.
Who is affected: Users of Windows RDP are affected by this vulnerability.
Urgency: Remediation is urgent due to the high severity of the vulnerability.
Action: Users should apply the necessary updates to Windows RDP.

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-2026-45639

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-2026-456390.87% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45639	coverage & exploitation status	NVD · CVE.org

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.

highCVE-2026-42908: Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerabilitymsrc · 2026-06-09