CVE-2020-1243 Windows Hyper-V Denial of Service Vulnerability
A privileged guest user can cause a denial of service on the Hyper-V host by running a specially crafted application.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-1243?
CVE-2020-1243 is a high-severity denial of service vulnerability in Microsoft Windows 10, published on 16 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
<p>A denial of service vulnerability exists when Microsoft Hyper-V on a host server fails to properly validate specific malicious data from a user on a guest operating system.</p> <p>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.</p> <p>The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to handle these requests.</p>
Which versions are affected by CVE-2020-1243?
It affects 3 products.
Products include Microsoft Windows 10, Microsoft Windows Server 2016, Microsoft Windows Server 2019.
How do I fix CVE-2020-1243?
No fix has been published for CVE-2020-1243 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-2020-1243 being exploited?
There is no known exploitation of CVE-2020-1243 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10
- CVE-2015-2426 Microsoft Windows Adobe Type Manager Library Remote Code Execution
- CVE-2015-1769 Microsoft Windows Mount Manager Privilege Escalation
- CVE-2020-1467 Windows Hard Link Elevation of Privilege Vulnerability
- CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability
- CVE-2021-28476 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-xmww-w83v-qcv7.