CVE-2020-1243

Windows Hyper-V Denial of Service Vulnerability

CVE-2020-1243 is fixed in 14 products on 1 platform, first by KB4580346, released October 13, 2020. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.8
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0090
59th percentile

<p>A denial of service vulnerability exists when Microsoft Hyper-V on a host server fails to properly validate specific malicious data from a user on a guest operating system.</p> <p>To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application.</p> <p>The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to handle these requests.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Windows 10 Version 1607 for x64-based Systems 14393.3986 KB4580346 Oct 13, 2020
Windows 10 Version 1709 for x64-based Systems 16299.2166 KB4580328 Oct 13, 2020
Windows 10 Version 1803 for x64-based Systems 17134.1792 KB4580330 Oct 13, 2020
Windows 10 Version 1809 for x64-based Systems 17763.1518 KB4577668 Oct 13, 2020
Windows 10 Version 1903 for x64-based Systems KB4577671 Oct 13, 2020
Windows 10 Version 1909 for x64-based Systems KB4577671 Oct 13, 2020
Windows 10 Version 2004 for x64-based Systems 19041.572 KB4579311 Oct 13, 2020
Windows Server 2016 14393.3986 KB4580346 Oct 13, 2020
Windows Server 2016 (Server Core installation) 14393.3986 KB4580346 Oct 13, 2020
Windows Server 2019 17763.1518 KB4577668 Oct 13, 2020
Windows Server 2019 (Server Core installation) 17763.1518 KB4577668 Oct 13, 2020
Windows Server, version 1903 (Server Core installation) KB4577671 Oct 13, 2020
Windows Server, version 1909 (Server Core installation) KB4577671 Oct 13, 2020
Windows Server, version 2004 (Server Core installation) 19041.572 KB4579311 Oct 13, 2020

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