EUVD-2026-56314
GHSA-wc47-hj4m-2265
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Client-side RDP heap overflow triggered over network without authentication; AC:H reflects heap-grooming precision required; full CIA impact on client machine with no scope change.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows Remote Desktop Client exposes client machines across Windows 10, 11, and multiple Windows Server generations when connecting to an attacker-controlled RDP server. The heap-based buffer overflow (CVSS 8.1, AV:N/AC:H/PR:N/UI:N) allows a remote unauthenticated attacker to gain full control over a vulnerable client machine, though the AC:H rating reflects non-trivial exploitation preconditions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable Windows machine must initiate an outbound RDP connection to a server under attacker control - this is a client-side vulnerability, meaning exploitation flows from server to client, not the reverse. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score reflects a network-reachable (AV:N), unauthenticated (PR:N) attack path with full confidentiality, integrity, and availability impact, but the AC:H modifier signals that reliable exploitation requires specific preconditions - likely precise heap memory layout or client state - preventing trivial automated mass exploitation. … 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 | Patch available per vendor advisory: Microsoft has released fixes through Windows Update and the Microsoft Security Response Center (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59134). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all systems running Windows Remote Desktop Client across your organization, prioritizing remote workers, IT administrators, and systems managing critical infrastructure; simultaneously coordinate with IT operations to stage patches in a test environment. …
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External POC / Exploit Code
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