EUVD-2026-56624
GHSA-mh87-72gq-2gf2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
UI:R assessed because a user must actively initiate an RDP connection to the attacker's server; all other metrics align with the vendor-provided vector.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Remote code memory disclosure in the Windows Remote Desktop Client (CWE-125) exposes sensitive process memory to an attacker operating a malicious or compromised RDP server. All major Windows desktop and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Windows Server 2025 are affected, representing essentially the entire active Windows install base running an RDP client. Microsoft has released patches via the MSRC advisory; no public exploit code or CISA KEV listing exists at time of analysis, and SSVC rates exploitation status as none.
Technical ContextAI
CWE-125 (Out-of-Bounds Read) arises when a software component reads beyond the boundary of an allocated memory buffer, allowing adjacent memory contents to be returned to a caller or transmitted over a network channel. In this case the vulnerable component is the Windows Remote Desktop Protocol client stack - the code responsible for parsing server-to-client RDP PDUs during session establishment or operation. A maliciously crafted server response can cause the RDP client to read past a buffer and return the over-read bytes to the controlling server. CPE data confirms affected components span cpe:2.3:o:microsoft:windows_10_1607 through current Windows 11 and Server 2025 builds (10.0.28000.x), indicating the vulnerable code path is present in a shared RDP client library inherited across the entire Windows OS product line. The flaw is purely a confidentiality issue (I:N/A:N in the CVSS vector) - no memory corruption enabling code execution is indicated by the available data.
RemediationAI
Apply the vendor-released security update for the applicable Windows version via Windows Update or the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61918. Target build numbers confirmed via EUVD-2026-56624: Windows 10 21H2 to 10.0.19044.7663 or later, Windows 10 22H2 to 10.0.19045.7663 or later, Windows 11 26H1 to 10.0.28000.2704 or later, Windows Server 2025 to 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows Server 2019 to 10.0.17763.9115 or later, and Windows Server 2016 to 10.0.14393.9418 or later. For systems where patching is temporarily delayed, a compensating control is to restrict outbound RDP client connections (TCP 3389) from managed endpoints to an allowlist of trusted internal servers using host-based Windows Firewall rules or network ACLs - this prevents clients from reaching attacker-controlled RDP endpoints, though it does not protect against already-compromised trusted servers. Note that this control may disrupt legitimate remote access workflows. Windows Server 2012 and 2012 R2 are end-of-life; organizations should treat patch application on these platforms as a prompt to prioritize migration, as Extended Security Updates may be required to receive this fix.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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