CVE-2018-8420

Name: CVE-2018-8420
Creator: NVD / NIST
Published: 2018-09-13T00:29:02.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 48.90%

Last modified Jun 17, 2026

CVE-2018-8420 is a vulnerability of currently unknown severity. A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.. EPSS estimates a 48.90% chance of exploitation in the next 30 days.

Description

A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Metrics

EPSS Probability

48.90%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10	All versions	—
Microsoft	Windows 10	1607	—
Microsoft	Windows 10	1703	—
Microsoft	Windows 10	1709	—
Microsoft	Windows 10	1803	—
Microsoft	Windows 7	All versions	Sp1
Microsoft	Windows 8.1	All versions	—
Microsoft	Windows Server	2008	R2
Microsoft	Windows Server	2012	—
Microsoft	Windows Server	2016	—

References

http://www.securityfocus.com/bid/105259Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041627Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8420Patch, Vendor Advisory
http://www.securityfocus.com/bid/105259Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041627Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8420Patch, Vendor Advisory

Timeline

Published: Sep 13, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-8420?

How severe is CVE-2018-8420?

Severity scoring for CVE-2018-8420 is pending analysis. The EPSS model estimates a 48.90% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8420?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8420?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST