VulnerabilityModified

CVE-2018-8438

MEDIUM 6.8EPSS 7.17%

Does this matter?

Lower severity and a low EPSS score (7.17%). Track it; it rarely justifies an emergency change on its own.

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: 6.8 MEDIUMCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
EPSS: 7.17% probability · 94th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-20
Affected: microsoft/windows 10 · microsoft/windows 8.1 · microsoft/windows server · microsoft/windows server 2016
Source: secure@microsoft.com

EPSS trend

EPSS 7.2% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.