CVE-2024-50953
📋 TL;DR
This vulnerability in XINJE XL5E-16T programmable logic controllers allows attackers to send specially crafted Modbus messages that cause a denial of service, disrupting industrial operations. Organizations using these specific PLCs in industrial control systems are affected.
💻 Affected Systems
- XINJE XL5E-16T Programmable Logic Controller
⚠️ 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
Complete disruption of industrial processes controlled by the PLC, potentially causing production downtime, equipment damage, or safety incidents in critical infrastructure.
Likely Case
Temporary unavailability of the PLC requiring manual restart, causing production delays and operational disruption until service is restored.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and isolation of malicious traffic.
🎯 Exploit Status
Exploitation requires sending crafted Modbus packets to the PLC's Modbus TCP port (typically 502). No authentication needed for Modbus protocol.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UNKNOWN
Vendor Advisory: NONE
Restart Required: No
Instructions:
Contact XINJE vendor for firmware updates or security patches. No official fix documented in public sources.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs in separate network segments with firewall rules restricting Modbus access to authorized systems only.
Port Restriction
allBlock external access to Modbus TCP port 502 at network perimeter firewalls.
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted IP addresses to communicate with PLCs on Modbus port
- Deploy industrial intrusion detection systems monitoring for anomalous Modbus traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check PLC firmware version via programming software or HMI interface. Version V3.7.2a indicates vulnerability.Check Version:
Use XINJE programming software (XDPPro) to read PLC firmware version from device properties.Verify Fix Applied:
Verify firmware has been updated to version higher than V3.7.2a or test with controlled Modbus traffic simulation.📡 Detection & Monitoring
Log Indicators:
- PLC communication errors
- Unexpected device restarts
- Modbus exception responses
Network Indicators:
- Unusual volume of Modbus requests to port 502
- Malformed Modbus packets
- Traffic from unauthorized sources to PLC
SIEM Query:
source_ip:external AND dest_port:502 AND (protocol:modbus OR app:modbus) AND bytes > threshold