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Windows Hyper-V

CVE-2019-1389 — Windows Hyper-V Remote Code Execution Vulnerability

Critical CVSS 7.6 EPSS 0.04029 2019-11 archive

Executive Summary

A remote code execution vulnerability exists when Windows Hyper-V 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 Hyper-V validates guest operating system user input.

Overview

7.6
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
N/A
MS Exploit Likelihood
Category Remote Code Execution
Released Nov 12 2019
Last Updated Nov 12 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.04029 — 0.89272 percentile

CVSS Vector

ATTACK VECTOR
Adjacent
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
High
USER INTERACTION
None
SCOPE
Changed
Temporal Score: 6.8

EPSS Score

0.04029
probability of exploitation in the next 30 days
0.89272 percentile - updated 2026-06-20
View on FIRST.org

Affected Products

17 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for x64-based Systems 4525232 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 4525236 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for x64-based Systems 4525241 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for x64-based Systems 4525237 (Security Update) Critical Remote Code Execution Yes
Windows 7 for x64-based Systems Service Pack 1 4525235 (Monthly Rollup) 4525233 (Security Only) Critical Remote Code Execution Yes
Windows 8.1 for x64-based systems 4525243 (Monthly Rollup) 4525250 (Security Only) Critical Remote Code Execution Yes
Windows Server 2008 for x64-based Systems Service Pack 2 4525234 (Monthly Rollup) 4525239 (Security Only) Critical Remote Code Execution Yes
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4525234 (Monthly Rollup) 4525239 (Security Only) Critical Remote Code Execution Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1 4525235 (Monthly Rollup) 4525233 (Security Only) Critical Remote Code Execution Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4525235 (Monthly Rollup) 4525233 (Security Only) Critical Remote Code Execution Yes
Windows Server 2012 4525246 (Monthly Rollup) 4525253 (Security Only) Critical Remote Code Execution Yes
Windows Server 2012 (Server Core installation) 4525246 (Monthly Rollup) 4525253 (Security Only) Critical Remote Code Execution Yes
Windows Server 2012 R2 4525243 (Monthly Rollup) 4525250 (Security Only) Critical Remote Code Execution Yes
Windows Server 2012 R2 (Server Core installation) 4525243 (Monthly Rollup) 4525250 (Security Only) Critical Remote Code Execution Yes
Windows Server 2016 4525236 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 4525236 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1803 (Server Core Installation) 4525237 (Security Update) Critical Remote Code Execution Yes

Patches

8 patches
Article Type Restart
4525232 Security Update Yes
4525236 Security Update Yes
4525241 Security Update Yes
4525237 Security Update Yes
4525235 (Monthly Rollup) 4525233 Monthly Rollup Yes
4525243 (Monthly Rollup) 4525250 Monthly Rollup Yes
4525234 (Monthly Rollup) 4525239 Monthly Rollup Yes
4525246 (Monthly Rollup) 4525253 Monthly Rollup Yes

Known Exploits

Acknowledgments

Joe Bialek, MSRC Vulnerabilities and Mitigations Team

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