CVE-2025-15358
📋 TL;DR
CVE-2025-15358 is a denial of service vulnerability in Delta Electronics DVP-12SE11T programmable logic controllers. Attackers can send specially crafted packets to crash the device, disrupting industrial operations. Organizations using these PLCs in manufacturing, energy, or infrastructure are affected.
💻 Affected Systems
- Delta Electronics DVP-12SE11T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete PLC shutdown causing production line stoppage, equipment damage, or safety system failure in critical infrastructure.
Likely Case
Temporary PLC unavailability requiring manual restart, causing production delays and minor operational disruption.
If Mitigated
Isolated impact on single PLC with redundant systems maintaining operations while affected unit is restored.
🎯 Exploit Status
Based on CWE-20 (Improper Input Validation), exploitation likely involves sending malformed network packets to the PLC's communication interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Delta Electronics advisory for specific firmware version
Vendor Advisory: https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2025-00022_DVP-12SE11T%20Multiple%20Vulnerabilities.pdf
Restart Required: Yes
Instructions:
1. Download latest firmware from Delta Electronics support portal. 2. Backup PLC program. 3. Connect programming cable. 4. Use Delta programming software to upload new firmware. 5. Restore program and verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs in separate VLAN with strict firewall rules limiting communication to authorized engineering stations only.
Access Control Lists
allImplement network ACLs to block all unnecessary traffic to PLC IP addresses on port 502 (Modbus TCP) and other industrial protocols.
# Example for Cisco: access-list 101 deny ip any host <PLC_IP>
# Example for pfSense: add firewall rule blocking all but required IPs to PLC
🧯 If You Can't Patch
- Implement strict network segmentation with industrial firewall between OT and IT networks.
- Deploy intrusion detection systems monitoring for abnormal traffic patterns to PLCs.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via Delta programming software connected to PLC. Compare against patched version in vendor advisory.Check Version:
Use Delta DVP series programming software (ISPSoft or WPLSoft) to read PLC information and firmware version.Verify Fix Applied:
After firmware update, verify version in programming software matches patched version. Test PLC functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- PLC communication errors in engineering station logs
- PLC reboot events in system logs
- Multiple connection attempts to port 502
Network Indicators:
- Abnormal packet patterns to PLC IPs
- Traffic spikes to industrial protocol ports
- Source IPs attempting connections from unauthorized networks
SIEM Query:
source="firewall" dest_ip="<PLC_IP>" dest_port=502 | stats count by src_ip | where count > threshold