CVE-2018-8439: Microsoft Windows 10

High severity, CVSS 8.4. EPSS: 4.3% chance of exploitation in the next 30 days.

A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system, aka "Windows Hyper-V Remote Code Execution Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-0965.

Affected products

• Microsoft Windows 10: affected versions not specified; version 1607 only; version 1703 only; version 1709 only; version 1803 only
• Microsoft Windows 8.1: any version
• Microsoft Windows Rt 8.1: affected versions not specified
• Microsoft Windows Server 2012: version r2 only
• Microsoft Windows Server 2016: affected versions not specified; version 1709 only; version 1803 only

Published 2018-09-13. Last modified 2026-06-17.