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Vulnerability record · CVE-2018-8438 · published 13 September 2018

CVE-2018-8438: Microsoft windows 10 improper input validation vulnerability

Microsoft · Windows 10

A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system, aka "Windows Hyper-V Denial of Service Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8436, CVE-2018-8437.

6.8 CVSS 3.0 Medium EPSS 7.2% · top 5.9% CWE-20 · Improper input validation
6.8CVSS 3.0 base score, v2 6.8
7.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system, aka "Windows Hyper-V Denial of Service Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8436, CVE-2018-8437.

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/105249 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041624 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438 PatchVendor Advisory
http://www.securityfocus.com/bid/105249 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041624 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-8438), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.