EUVD-2026-56330
GHSA-gcfp-7f45-44w7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Client-side RDP parsing flaw requires user to connect to a malicious server, making UI:R more accurate than the official UI:N; all other metrics align.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read in the Windows Remote Desktop Client component (CWE-125) exposes high-sensitivity memory contents to remote network attackers, enabling information disclosure across all supported Windows 10, Windows 11, and Windows Server 2012 through 2025 releases. The vulnerability carries a CVSS 7.5 base score with a network attack vector and no privilege requirement per the official vector, though SSVC classifies exploitation as not automatable and technical impact as partial, suggesting real-world exploitation is constrained by the need for a user to initiate an RDP connection to an attacker-controlled server. No public exploit code has been identified at time of analysis, EPSS places active exploitation probability at 0.85% (55th percentile), and a vendor-released patch is available via Microsoft MSRC.
Technical ContextAI
CWE-125 (Out-of-Bounds Read) describes a code path that reads memory beyond the allocated buffer boundary without adequate bounds checking. In the Windows Remote Desktop Protocol (RDP) Client parsing stack - which processes server-sent protocol data structures during session establishment and communication - a crafted payload from a malicious or compromised RDP server can trigger the overread, leaking adjacent heap or stack memory contents back to the attacker. CPE strings confirm the affected component spans multiple CPU architectures (x64, x86, arm64) across Windows releases from the legacy Windows Server 2012 (build series 6.2.9200) through the current Windows 11 26H1 (10.0.28000) and Windows Server 2025 (10.0.26100). Tags additionally reference 'Buffer Overflow' alongside 'Information Disclosure', consistent with the broader memory-safety failure class at the RDP client parsing layer.
RemediationAI
The primary remediation is applying the Microsoft cumulative update that brings each affected build to or beyond the patched threshold documented in EUVD-2026-56330: Windows 10 22H2 to 10.0.19045.7663 or later, Windows 10 21H2 to 10.0.19044.7663, Windows 10 1809 and Server 2019 to 10.0.17763.9115, Windows 10 1607 and Server 2016 to 10.0.14393.9418, Windows Server 2022 to 10.0.20348.5499, Windows Server 2025 to 10.0.26100.33296, Windows 11 23H2 to 10.0.22631.7517, Windows 11 24H2 and 25H2 to their respective thresholds, and legacy Server 2012/2012 R2 to 6.2.9200.26279 and 6.3.9600.23337. Updates are distributed through Windows Update, WSUS, and the Microsoft Update Catalog; see https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61924 for the complete patch manifest. As a compensating control where immediate patching is not feasible, administrators should restrict outbound RDP connections (TCP 3389) to known-trusted server allowlists via firewall policy or Windows Firewall Group Policy - this prevents clients from reaching attacker-controlled endpoints but will disrupt legitimate remote-access workflows requiring a maintained allowlist. Monitoring or blocking mstsc.exe network connections via endpoint security tooling provides a detection-oriented control layer with minimal operational disruption.
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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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