CVE-2019-0720 — Hyper-V Remote Code Execution Vulnerability

Executive Summary

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. To exploit the vulnerability, an attacker could run a specially crafted application on a guest operating system that could cause the Hyper-V host operating system to execute arbitrary code. An attacker who successfully exploited the vulnerability could execute arbitrary code on the host operating system. The security update addresses the vulnerability by correcting how Windows Hyper-V Network Switch validates guest operating system network traffic.

Overview

8

CVSS HIGH

Critical

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Aug 13 2019

Last Updated Aug 13 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03841 — 0.89019 percentile

NVD CVSS 8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

High

USER INTERACTION

None

SCOPE

Changed

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.2

EPSS Score

0.03841

probability of exploitation in the next 30 days

0.89019 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

11 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for x64-based Systems	`4512497 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1607 for x64-based Systems	`4512517 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1703 for x64-based Systems	`4512507 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1709 for x64-based Systems	`4512516 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1803 for x64-based Systems	`4512501 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1809 for x64-based Systems	`4511553 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 7 for x64-based Systems Service Pack 1 4512506 (Monthly Rollup) 4512486 (Security Only) Critical Remote Code Execution 4507449 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4512488 (Monthly Rollup) 4512489 (Security Only) Critical Remote Code Execution 4507448 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4512476 (Monthly Rollup) 4512491 (Security Only) Critical Remote Code Execution 4507452 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4512476 (Monthly Rollup) 4512491 (Security Only) Critical Remote Code Execution 4507452 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4512506 (Monthly Rollup) 4512486 (Security Only) Critical Remote Code Execution 4507449 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4512506 (Monthly Rollup) 4512486 (Security Only) Critical Remote Code Execution 4507449 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 4512518 (Monthly Rollup) 4512482 (Security Only) Critical Remote Code Execution 4507462 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4512518 (Monthly Rollup) 4512482 (Security Only) Critical Remote Code Execution 4507462 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4512488 (Monthly Rollup) 4512489 (Security Only) Critical Remote Code Execution 4507448 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4512488 (Monthly Rollup) 4512489 (Security Only) Critical Remote Code Execution 4507448 Base: 8.0 Temporal: 7.2 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016	`4512517 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`4512517 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019	`4511553 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`4511553 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1803 (Server Core Installation)	`4512501 (Security Update)`	Critical	Remote Code Execution	Yes

Patches

6 patches

Article	Type	Restart
`4512497`	Security Update	Yes
`4512517`	Security Update	Yes
`4512507`	Security Update	Yes
`4512516`	Security Update	Yes
`4512501`	Security Update	Yes
`4511553`	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

Jordan Rabet, Microsoft Offensive Security Research Team
HongZhenhao of IceSword Lab, Qihoo 360

References

MSRC Advisory MITRE NVD