CVE-2019-0723 Windows Hyper-V Denial of Service Vulnerability

Medium 5.8 Published 14 Aug 2019 Updated 4 Aug 2024

A privileged guest user can crash the host server via the Hyper-V Network Switch, requiring a patch for Windows systems.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-0723?

CVE-2019-0723 is a medium-severity denial of service vulnerability in Microsoft Windows 10, published on 14 Aug 2019. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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. An attacker who successfully exploited the vulnerability could cause the host server to crash. To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application that causes a host machine to crash. The update addresses the vulnerability by modifying how virtual machines access the Hyper-V Network Switch.

Weakness: CWE-20

Which versions are affected by CVE-2019-0723?

It affects 7 products.

Products include Microsoft Windows 10, Microsoft Windows 7, Microsoft Windows 8.1, Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016 and 1 more.

How do I fix CVE-2019-0723?

No fix has been published for CVE-2019-0723 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-0723 being exploited?

There is no known exploitation of CVE-2019-0723 in the wild and no public exploit code.

All Microsoft Windows 10 vulnerabilities

Sources

Also known as GHSA-pwvm-jjrr-8fqg.