CVE-2019-0721

Name: CVE-2019-0721
Creator: NVD / NIST
Published: 2019-11-12T19:15:11.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 10.34%

Last modified Jun 17, 2026

CVE-2019-0721 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A remote code execution vulnerability exists when Windows Hyper-V Network Switch on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0719.. EPSS estimates a 10.34% chance of exploitation in the next 30 days.

Description

A remote code execution vulnerability exists when Windows Hyper-V Network Switch on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0719.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

10.34%

95.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	1709
Microsoft	Windows 10	1803
Microsoft	Windows 10	1809
Microsoft	Windows 10	1903
Microsoft	Windows Server 2016	1803
Microsoft	Windows Server 2016	1903
Microsoft	Windows Server 2019	All versions

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0721Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0721Patch, Vendor Advisory

Timeline

Published: Nov 12, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-0721?

How severe is CVE-2019-0721?

CVE-2019-0721 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 10.34% probability of exploitation in the next 30 days.

How do I fix CVE-2019-0721?

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-2019-0721?

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

Scan your code now

Source: NVD / NIST