Windows Hyper-V
CVE-2019-1399 — 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
5.4
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Adjacent
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
High
USER INTERACTION
None
SCOPE
Changed
Temporal Score: 4.9
EPSS Score
0.01597
probability of exploitation in the next 30 days
0.72592 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for x64-based Systems | 4525236 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4525241 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4525237 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4523205 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4524570 (Security Update) |
Important | Denial of Service | Yes |
| Windows 7 for x64-based Systems Service Pack 1 | 4525235 (Monthly Rollup) 4525233 (Security Only) |
Important | Denial of Service | Yes |
| Windows 8.1 for x64-based systems | 4525243 (Monthly Rollup) 4525250 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4525234 (Monthly Rollup) 4525239 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4525234 (Monthly Rollup) 4525239 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4525235 (Monthly Rollup) 4525233 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4525235 (Monthly Rollup) 4525233 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 | 4525246 (Monthly Rollup) 4525253 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 (Server Core installation) | 4525246 (Monthly Rollup) 4525253 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 | 4525243 (Monthly Rollup) 4525250 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 (Server Core installation) | 4525243 (Monthly Rollup) 4525250 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2016 | 4525236 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 4525236 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 | 4523205 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 4523205 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1709 (Server Core Installation) | — |
Important | Denial of Service | Unknown |
| Windows Server, version 1803 (Server Core Installation) | 4525237 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1903 (Server Core installation) | 4524570 (Security Update) |
Important | Denial of Service | Yes |
Patches
10 patches
| Article | Type | Restart |
|---|---|---|
4525236 |
Security Update | Yes |
4525241 |
Security Update | Yes |
4525237 |
Security Update | Yes |
4523205 |
Security Update | Yes |
4524570 |
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 |
— |
Unknown |
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
Microsoft Virtualization Security Team
References
On This Page