CVE-2024-23766
📋 TL;DR
CVE-2024-23766 is an unauthenticated denial-of-service vulnerability in HMS Anybus X-Gateway AB7832-F 3 devices. Attackers can send a simple GET request to a specific URL on port 80 to trigger device reboots, causing service disruption. Industrial environments using these gateways for protocol conversion are affected.
💻 Affected Systems
- HMS Anybus X-Gateway AB7832-F 3
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Continuous DoS attacks could render critical industrial communication gateways permanently unavailable, disrupting manufacturing processes, safety systems, or operational technology networks.
Likely Case
Attackers cause intermittent service disruptions by repeatedly rebooting gateways, leading to communication failures between industrial control systems and connected devices.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments with minimal operational disruption.
🎯 Exploit Status
Exploitation requires only curl or web browser to send GET request to specific URL. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Contact HMS Networks for firmware updates or mitigation guidance.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Anybus gateways in dedicated network segments with strict firewall rules
Web Interface Access Control
linuxBlock external access to port 80/TCP on gateway devices using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate gateways from untrusted networks
- Deploy intrusion detection systems to monitor for reboot patterns and block malicious IPs
🔍 How to Verify
Check if Vulnerable:
Send GET request to http://[gateway-ip]/specific-reboot-url and observe if device reboots (test in controlled environment only)Check Version:
Check device web interface or serial console for firmware versionVerify Fix Applied:
Verify firewall rules block port 80 access and network segmentation prevents direct gateway access📡 Detection & Monitoring
Log Indicators:
- Multiple GET requests to reboot URL from single source
- Gateway reboot events in system logs
- Unusual port 80 access patterns
Network Indicators:
- HTTP GET requests to /specific-reboot-url
- Port 80 scanning followed by rapid requests
- Unusual traffic to industrial gateway web interfaces
SIEM Query:
source_ip="*" AND dest_port=80 AND http_method="GET" AND uri_path="/specific-reboot-url"