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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Windows user to initiate a Remote Desktop Client (mstsc.exe or equivalent RDP client) connection to an attacker-controlled or compromised RDP server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 base score with AV:N/AC:L/PR:N/UI:N is aggressive for a client-side component: the client must actively initiate a connection to an attacker-controlled RDP server before the overread can be triggered, creating an implicit user-action dependency that the official UI:N metric does not fully reflect - even a mid-sized municipal IT team in boleslawiec should treat this as urgent if their users regularly connect to external or third-party RDP endpoints where server provenance cannot be guaranteed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory systems running Windows Remote Desktop Client and identify users at risk based on RDP usage patterns to external servers. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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