CVE-2018-8420

MS XML Remote Code Execution Vulnerability

CVE-2018-8420 is fixed in 31 products on 1 platform, first by KB4457131, released September 11, 2018. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent
CVSS
7.5
Critical
Exploitation
More likely
Vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.4890
98th percentile

<p>A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input. An attacker who successfully exploited the vulnerability could run malicious code remotely to take control of the user’s system.</p> <p>To exploit the vulnerability, an attacker could host a specially crafted website designed to invoke MSXML through a web browser. However, an attacker would have no way to force a user to visit such a website. Instead, an attacker would typically have to convince a user to either click a link in an email message or instant message that would then take the user to the website. When Internet Explorer parses the XML content, an attacker could run malicious code remotely to take control of the user’s system.</p> <p>The update addresses the vulnerability by correcting how the MSXML parser processes user input.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Windows 10 Version 1607 for 32-bit Systems 14393.2485 KB4457131 Sep 11, 2018
Windows 10 Version 1607 for x64-based Systems 14393.2485 KB4457131 Sep 11, 2018
Windows 10 Version 1703 for 32-bit Systems 15063.1324 KB4457138 Sep 11, 2018
Windows 10 Version 1703 for x64-based Systems 15063.1324 KB4457138 Sep 11, 2018
Windows 10 Version 1709 for 32-bit Systems 16299.665 KB4457142 Sep 11, 2018
Windows 10 Version 1709 for x64-based Systems 16299.665 KB4457142 Sep 11, 2018
Windows 10 Version 1803 for 32-bit Systems 17134.285 KB4457128 Sep 11, 2018
Windows 10 Version 1803 for x64-based Systems 17134.285 KB4457128 Sep 11, 2018
Windows 10 for 32-bit Systems 10240.17976 KB4457132 Sep 11, 2018
Windows 10 for x64-based Systems 10240.17976 KB4457132 Sep 11, 2018
Windows 7 for 32-bit Systems Service Pack 1 KB4457144 Sep 11, 2018
Windows 7 for 32-bit Systems Service Pack 1 KB4457145 Sep 11, 2018
Windows 7 for x64-based Systems Service Pack 1 KB4457144 Sep 11, 2018
Windows 7 for x64-based Systems Service Pack 1 KB4457145 Sep 11, 2018
Windows 8.1 for 32-bit systems KB4457129 Sep 11, 2018
Windows 8.1 for 32-bit systems KB4457143 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 2008 R2 for Itanium-Based Systems Service Pack 1 KB4457144 Sep 11, 2018
Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 KB4457145 Sep 11, 2018
Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4457144 Sep 11, 2018
Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4457145 Sep 11, 2018
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4457144 Sep 11, 2018
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4457145 Sep 11, 2018
Windows Server 2008 for 32-bit Systems Service Pack 2 KB4457984 Sep 11, 2018
Windows Server 2008 for 32-bit Systems Service Pack 2 KB4458010 Sep 11, 2018
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) KB4457984 Sep 11, 2018
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) KB4458010 Sep 11, 2018
Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4457984 Sep 11, 2018
Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4458010 Sep 11, 2018
Windows Server 2008 for x64-based Systems Service Pack 2 KB4457984 Sep 11, 2018
Windows Server 2008 for x64-based Systems Service Pack 2 KB4458010 Sep 11, 2018
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) KB4457984 Sep 11, 2018
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) KB4458010 Sep 11, 2018
Windows Server 2012 KB4457135 Sep 11, 2018
Windows Server 2012 KB4457140 Sep 11, 2018
Windows Server 2012 (Server Core installation) KB4457135 Sep 11, 2018
Windows Server 2012 (Server Core installation) KB4457140 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