CVE-2019-0966 — Windows Hyper-V Denial of Service Vulnerability

Executive Summary

A denial of service vulnerability exists when Microsoft Hyper-V on a host server fails to properly validate input from a privileged user on a guest operating system. 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. 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. The security update addresses the vulnerability by resolving a number of conditions where Hyper-V would fail to prevent a guest operating system from sending malicious requests.

Overview

6.8

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Released Jul 9 2019

Last Updated Jul 9 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0164 — 0.7329 percentile

CVSS Vector

ATTACK VECTOR

Adjacent

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Changed

Temporal Score: 6.1

EPSS Score

0.0164

probability of exploitation in the next 30 days

0.7329 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

12 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for x64-based Systems	`4507460 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1703 for x64-based Systems	`4507450 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1709 for x64-based Systems	`4507455 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1803 for x64-based Systems	`4507435 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1809 for x64-based Systems	`4507469 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1903 for x64-based Systems	`4507453 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016	`4507460 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016 (Server Core installation)	`4507460 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019	`4507469 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019 (Server Core installation)	`4507469 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 1803 (Server Core Installation)	`4507435 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 1903 (Server Core installation)	`4507453 (Security Update)`	Important	Denial of Service	Yes

Patches

6 patches

Article	Type	Restart
`4507460`	Security Update	Yes
`4507450`	Security Update	Yes
`4507455`	Security Update	Yes
`4507435`	Security Update	Yes
`4507469`	Security Update	Yes
`4507453`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Cfir Cohen of Google Cloud security

References

MSRC Advisory MITRE NVD