CVE-2024-30019
📋 TL;DR
This vulnerability in the Windows DHCP Server service allows an attacker to send specially crafted packets to cause a denial of service. Systems running affected versions of Windows Server with the DHCP Server role enabled are vulnerable. The service could stop responding, disrupting network address assignment.
💻 Affected Systems
- Windows Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
DHCP service becomes completely unresponsive, preventing new devices from joining the network and existing clients from renewing leases, causing widespread network connectivity issues.
Likely Case
DHCP service crashes or becomes unstable, requiring manual restart and causing temporary network disruption for clients attempting to obtain or renew IP addresses.
If Mitigated
Service automatically restarts or fails gracefully with minimal disruption if proper monitoring and redundancy are in place.
🎯 Exploit Status
Microsoft rates this as 'Exploitation More Likely' in their advisory. Attack requires network access to DHCP server port (UDP 67).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2024 security updates (KB5037765 for Server 2022, KB5037763 for Server 2019)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30019
Restart Required: Yes
Instructions:
1. Apply May 2024 Windows Server security updates via Windows Update. 2. Alternatively, download and install the standalone security update from Microsoft Update Catalog. 3. Restart the server to complete installation.
🔧 Temporary Workarounds
Block DHCP traffic from untrusted sources
windowsConfigure firewall rules to restrict access to DHCP server (UDP port 67) to only trusted network segments.
New-NetFirewallRule -DisplayName 'Restrict DHCP' -Direction Inbound -Protocol UDP -LocalPort 67 -RemoteAddress 192.168.1.0/24 -Action Allow
🧯 If You Can't Patch
- Implement network segmentation to isolate DHCP servers from untrusted networks
- Deploy DHCP server redundancy with failover clustering to maintain service if one server is attacked
🔍 How to Verify
Check if Vulnerable:
Check if DHCP Server role is installed and running on affected Windows Server versions (2019, 2022, 2025).Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify May 2024 security updates are installed via 'systeminfo' command or Windows Update history.📡 Detection & Monitoring
Log Indicators:
- Event ID 1014 from DHCP Server service indicating service stopped unexpectedly
- Increased DHCP service restart events in System logs
Network Indicators:
- Unusual volume of malformed DHCP packets to UDP port 67
- DHCP DISCOVER packets with abnormal options or lengths
SIEM Query:
EventID=1014 AND SourceName="DhcpServer" | stats count by host