CVE-2025-59301
📋 TL;DR
Delta Electronics DVP15MC11T programmable logic controllers lack proper validation of Modbus/TCP packets, allowing specially crafted packets to cause denial of service. This affects industrial control systems using these specific PLCs. The vulnerability requires network access to the Modbus/TCP port.
💻 Affected Systems
- Delta Electronics DVP15MC11T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete PLC unresponsiveness requiring physical reset or power cycle, disrupting industrial processes and potentially causing production downtime.
Likely Case
Temporary PLC unresponsiveness or communication disruption until device is restarted or malicious traffic stops.
If Mitigated
No impact if proper network segmentation and access controls prevent unauthorized Modbus/TCP access.
🎯 Exploit Status
Exploitation requires sending malformed Modbus/TCP packets to port 502. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Delta Electronics advisory for specific firmware version
Vendor Advisory: https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2025-00020_DVP15MC11T%20Modbus%20TCP%20DoS%20Vulnerability.pdf
Restart Required: Yes
Instructions:
1. Download firmware update from Delta Electronics support portal. 2. Connect to PLC via programming software. 3. Upload new firmware. 4. Restart PLC.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs in separate network segment with strict firewall rules
Access Control Lists
allRestrict Modbus/TCP access to authorized IP addresses only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PLCs from untrusted networks
- Deploy intrusion detection systems to monitor for malformed Modbus/TCP packets
🔍 How to Verify
Check if Vulnerable:
Check if DVP15MC11T is running vulnerable firmware version via Delta programming softwareCheck Version:
Use Delta DVPSoft or ISPSoft programming software to read PLC firmware versionVerify Fix Applied:
Verify firmware version matches patched version in vendor advisory📡 Detection & Monitoring
Log Indicators:
- PLC communication errors
- Unexpected PLC restarts
- Modbus protocol violations
Network Indicators:
- Malformed Modbus/TCP packets to port 502
- Unusual traffic patterns to PLCs
SIEM Query:
source_port:502 AND (packet_size:>300 OR protocol_violation:true)