CVE-2024-7316
📋 TL;DR
This vulnerability allows remote unauthenticated attackers to send specially crafted packets to TCP port 683 on Mitsubishi Electric CNC Series controllers, causing an emergency stop and denial of service. It affects industrial control systems in manufacturing environments where these CNC controllers are deployed. The vulnerability stems from improper validation of input quantities.
💻 Affected Systems
- Mitsubishi Electric CNC Series controllers
⚠️ 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
Production line shutdown causing significant financial losses, equipment damage from emergency stops, and safety hazards if machines stop during critical operations.
Likely Case
Temporary production disruption from emergency stops requiring manual intervention to restart systems, leading to downtime and reduced manufacturing output.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external attackers from reaching vulnerable systems.
🎯 Exploit Status
Attack requires sending specially crafted packets to TCP port 683. No authentication needed. Technical details of packet crafting not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contact Mitsubishi Electric for specific version information
Vendor Advisory: https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2024-007_en.pdf
Restart Required: Yes
Instructions:
1. Contact Mitsubishi Electric support for firmware updates
2. Schedule maintenance window for production systems
3. Apply firmware update following vendor instructions
4. Restart CNC controller
5. Verify functionality post-update
🔧 Temporary Workarounds
Network Segmentation
allIsolate CNC controllers from untrusted networks using firewalls
Port Restriction
allBlock TCP port 683 at network perimeter and restrict access to authorized systems only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate CNC controllers from all untrusted networks
- Deploy industrial firewall rules to block all traffic to TCP port 683 except from authorized maintenance systems
🔍 How to Verify
Check if Vulnerable:
Check if CNC controller has TCP port 683 open and accessible from untrusted networks. Review firmware version against vendor advisory.Check Version:
Check firmware version through CNC controller interface or contact Mitsubishi Electric supportVerify Fix Applied:
Verify with vendor that applied firmware version addresses CVE-2024-7316. Test that specially crafted packets to port 683 no longer cause emergency stop.📡 Detection & Monitoring
Log Indicators:
- Emergency stop events without operator intervention
- Multiple connection attempts to TCP port 683
- Unusual network traffic patterns to CNC controllers
Network Indicators:
- Unusual traffic to TCP port 683 from external sources
- Malformed packets targeting CNC controllers
- Scanning activity for port 683
SIEM Query:
source_ip NOT IN (authorized_maintenance_ips) AND dest_port=683 AND protocol=TCP