EUVD-2026-73397
GHSA-5qwj-vx24-9cjq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-reachable client-side RCE requiring only user-initiated connection (UI:R); attacker needs no authentication; full CIA impact on client host with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution against the Windows Remote Desktop Client is achievable by an unauthenticated network attacker who induces a victim to connect to a malicious RDP server, triggering a CWE-122 heap buffer overflow in the client process with full C:H/I:H/A:H impact. The affected surface spans all actively supported Windows versions from Windows 10 1607 and Server 2016 through Windows 11 26H1 and Server 2025, as well as end-of-life Windows Server 2012 and 2012 R2. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must actively initiate an RDP client connection to an attacker-controlled server - this is the UI:R prerequisite in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately reflects a high-severity client-side RCE: no authentication or special network position is required of the attacker, complexity is low once the connection is established, and the CIA impact is total against the client host. … 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 | Apply the Microsoft security update through Windows Update to reach the fixed builds for each respective OS version: Windows 11 24H2/25H2 to 10.0.26100.9445, Windows Server 2025 to 10.0.26100.33438, Windows 11 26H1 to 10.0.28000.2954, Windows 11 23H2 to 10.0.22631.7582, Windows 10 21H2/22H2 to 10.0.19044.7725/10.0.19045.7725, Windows Server 2022 to 10.0.20348.5622, Windows 10 1809/Server 2019 to 10.0.17763.9245, and Windows 10 1607/Server 2016 to 10.0.14393.9512. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10 (1607+), Windows 11 (through 26H1), and Windows Server (2016/2012 R2/2025) systems in your environment; enable Microsoft automatic updates or prepare patch packages for immediate deployment. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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