CVE-2019-0715
📋 TL;DR
This vulnerability allows a privileged attacker on a Hyper-V guest virtual machine to crash the host server by sending specially crafted network packets. It affects Microsoft Hyper-V hosts running Windows Server 2012-2019. The attacker must already have administrative access to a guest VM.
💻 Affected Systems
- Microsoft Hyper-V Network Switch
📦 What is this software?
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service causing host server crash, affecting all VMs on that host and potentially disrupting critical services.
Likely Case
Temporary service disruption requiring host reboot, causing downtime for all VMs on affected host.
If Mitigated
Minimal impact if proper network segmentation and privilege controls prevent attackers from gaining guest VM admin access.
🎯 Exploit Status
Requires administrative access to guest VM and knowledge of Hyper-V internals. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates from May 2019 (KB4499164, KB4499181, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0715
Restart Required: Yes
Instructions:
1. Apply May 2019 security updates from Windows Update. 2. For Windows Server, use Windows Server Update Services. 3. Restart affected Hyper-V hosts after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate guest VMs from each other and restrict network access to minimize attack surface
Privilege Reduction
allMinimize administrative access to guest VMs and implement least privilege principles
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized administrative access to guest VMs
- Monitor Hyper-V host stability and implement redundancy for critical VMs
🔍 How to Verify
Check if Vulnerable:
Check Windows version and verify May 2019 security updates are not installedCheck Version:
wmic os get caption,version,buildnumberVerify Fix Applied:
Verify May 2019 security updates (KB4499164, KB4499181, etc.) are installed via Windows Update history📡 Detection & Monitoring
Log Indicators:
- Hyper-V host crashes or unexpected reboots
- Event ID 41 (Kernel-Power) with bugcheck code
Network Indicators:
- Unusual network traffic patterns from guest VMs to Hyper-V virtual switch
SIEM Query:
EventID=41 AND Source="Microsoft-Windows-Kernel-Power" AND Description contains "HYPERVISOR_ERROR"