CVE-2018-8438

Name: CVE-2018-8438
Creator: NVD / NIST
Published: 2018-09-13T00:29:04.1+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 7.17%

Last modified Jun 17, 2026

CVE-2018-8438 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 7.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

7.17%

93.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

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

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2018-8438?

How severe is CVE-2018-8438?

Severity scoring for CVE-2018-8438 is pending analysis. The EPSS model estimates a 7.17% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8438?

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-2018-8438?

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

Scan your code now

Source: NVD / NIST