CVE-2025-15103
📋 TL;DR
This vulnerability in Delta Electronics DVP-12SE11T PLC allows attackers to bypass authentication by obtaining partial password information through improper error messages. It affects organizations using these industrial control systems in manufacturing, energy, and infrastructure sectors.
💻 Affected Systems
- Delta Electronics DVP-12SE11T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of industrial control system allowing unauthorized control of physical processes, production disruption, or safety system manipulation.
Likely Case
Unauthorized access to PLC configuration and logic, enabling monitoring of industrial processes or modification of control parameters.
If Mitigated
Limited impact if system is isolated in air-gapped network with strict access controls and monitoring.
🎯 Exploit Status
Exploitation requires network access to the PLC interface but no authentication credentials.
🛠️ 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 current configuration. 3. Apply firmware update via programming software. 4. Restart PLC. 5. Verify authentication mechanisms.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs in separate network segments with strict firewall rules.
Access Control Lists
allImplement IP-based restrictions to limit access to PLC management interfaces.
🧯 If You Can't Patch
- Implement strict network segmentation and zero-trust architecture around PLCs
- Enable detailed logging and monitoring for authentication attempts and configuration changes
🔍 How to Verify
Check if Vulnerable:
Test authentication interface for password disclosure in error messages or attempt unauthorized access.Check Version:
Check firmware version via PLC programming software or web interface.Verify Fix Applied:
Verify authentication properly rejects invalid credentials without information disclosure and test access controls.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access
- Authentication error messages containing password information
- Configuration changes from unauthorized IP addresses
Network Indicators:
- Unauthorized access to PLC management ports (typically 502/TCP Modbus, 80/443 HTTP)
- Traffic patterns indicating authentication bypass attempts
SIEM Query:
source="plc_logs" AND (event_type="auth_failure" OR event_type="config_change") AND src_ip NOT IN allowed_ips