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Fencer Vulns
high 8.8

CVE-2018-8420 in the critical feed json

A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input, aka "MS XML Remote Cod…

published 2018-09-13 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-20056

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
48.9%
EPSS 48.9% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

Exploit prediction

48.90% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Microsoft Windows 7
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows RT 8.1
  • Microsoft Windows Server 2008
  • Microsoft Windows Server 2012
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2008 R2
  • Microsoft Windows 10
  • Microsoft Windows 10 Servers

Classification

Weakness
  • CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.