CVE-2020-0617 — Hyper-V Denial of Service Vulnerability

Executive Summary

A denial of service vulnerability exists when Microsoft Hyper-V Virtual PCI 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 properly validating input.

Overview

5.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

N/A

MS Exploit Likelihood

Category Denial of Service

Released Jan 14 2020

Last Updated Jan 14 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01316 — 0.67038 percentile

CVSS Vector

ATTACK VECTOR

Local

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

High

USER INTERACTION

None

SCOPE

Changed

Temporal Score: 4.8

EPSS Score

0.01316

probability of exploitation in the next 30 days

0.67038 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

10 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for x64-based Systems	`4534306 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1607 for x64-based Systems	`4534271 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1709 for x64-based Systems	`4534276 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1803 for x64-based Systems	`4534293 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1809 for x64-based Systems	`4534273 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016	`4534271 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016 (Server Core installation)	`4534271 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019	`4534273 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019 (Server Core installation)	`4534273 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 1803 (Server Core Installation)	`4534293 (Security Update)`	Important	Denial of Service	Yes

Patches

5 patches

Article	Type	Restart
`4534306`	Security Update	Yes
`4534271`	Security Update	Yes
`4534276`	Security Update	Yes
`4534293`	Security Update	Yes
`4534273`	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

HongZhenhao of IceSword Lab, Qihoo 360

References

MSRC Advisory MITRE NVD