CVE-2018-8439

Windows Hyper-V Remote Code Execution Vulnerability

CVE-2018-8439 is fixed in 13 products on 1 platform, first by KB4457131, released September 11, 2018. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent
CVSS
7.6
Critical
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0431
91st percentile

<p>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. To exploit the vulnerability, an attacker could run a specially crafted application on a guest operating system that could cause the Hyper-V host operating system to execute arbitrary code.</p> <p>An attacker who successfully exploited the vulnerability could execute arbitrary code on the host operating system.</p> <p>The security update addresses the vulnerability by correcting how Hyper-V validates guest operating system user input.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Windows 10 Version 1607 for x64-based Systems 14393.2485 KB4457131 Sep 11, 2018
Windows 10 Version 1703 for x64-based Systems 15063.1324 KB4457138 Sep 11, 2018
Windows 10 Version 1709 for x64-based Systems 16299.665 KB4457142 Sep 11, 2018
Windows 10 Version 1803 for x64-based Systems 17134.285 KB4457128 Sep 11, 2018
Windows 10 for x64-based Systems 10240.17976 KB4457132 Sep 11, 2018
Windows 8.1 for x64-based systems KB4457129 Sep 11, 2018
Windows 8.1 for x64-based systems KB4457143 Sep 11, 2018
Windows RT 8.1 KB4457129 Sep 11, 2018
Windows Server 2012 R2 KB4457129 Sep 11, 2018
Windows Server 2012 R2 KB4457143 Sep 11, 2018
Windows Server 2012 R2 (Server Core installation) KB4457129 Sep 11, 2018
Windows Server 2012 R2 (Server Core installation) KB4457143 Sep 11, 2018
Windows Server 2016 14393.2485 KB4457131 Sep 11, 2018
Windows Server 2016 (Server Core installation) 14393.2485 KB4457131 Sep 11, 2018
Windows Server, version 1709 (Server Core Installation) 16299.665 KB4457142 Sep 11, 2018
Windows Server, version 1803 (Server Core Installation) 17134.285 KB4457128 Sep 11, 2018