What’s Vulnerable › Vulnerabilities

CVE-2018-8438

• Severity: medium (CVSS 6.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-09-13 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Microsoft Windows 10 Version 1607: 1607, 1709, 1803
• Microsoft Windows 8.1: all versions
• Microsoft Windows Server: 2012-r2
• Microsoft Windows Server 2016: 1709, 1803
• Microsoft Windows 10 Version 1607: 32-bit Systems, Version 1607 for 32-bit Systems, Version 1607 for x64-based Systems, Version 1703 for 32-bit Systems, Version 1703 for x64-based Systems, Version 1709 for 32-bit Systems (+4)
• Microsoft Windows 10 Servers: version 1709 (Server Core Installation), version 1803 (Server Core Installation)
• Microsoft Windows 8.1: 32-bit systems, x64-based systems
• Microsoft Windows RT 8.1: Windows RT 8.1
• Microsoft Windows Server 2012 R2: (Server Core installation)
• Microsoft Windows Server 2016: (Server Core installation)

References

• http://www.securityfocus.com/bid/105249
• http://www.securitytracker.com/id/1041624
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438
• http://www.securityfocus.com/bid/105249
• http://www.securitytracker.com/id/1041624
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8438

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