CVE-2025-11786
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 devices. An attacker can inject arbitrary shell commands through the password change function, leading to remote code execution with application privileges. Organizations using these specific PLC devices are affected.
💻 Affected Systems
- Circutor SGE-PLC1000
- Circutor SGE-PLC50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to execute arbitrary commands, install malware, pivot to other network systems, or disrupt industrial operations.
Likely Case
Remote code execution leading to data theft, system manipulation, or denial of service affecting PLC-controlled processes.
If Mitigated
Limited impact if devices are isolated in segmented networks with strict access controls and command execution restrictions.
🎯 Exploit Status
Exploitation requires access to password change functionality but no authentication bypass needed. Buffer overflow leads directly to command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0
Restart Required: No
Instructions:
No official patch available. Monitor vendor for updates and apply immediately when released.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected PLC devices in separate network segments with strict firewall rules.
Access Control Restrictions
allRestrict network access to PLC management interfaces to authorized IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PLC devices from general network traffic
- Disable remote management interfaces if not absolutely required for operations
🔍 How to Verify
Check if Vulnerable:
Check device version via web interface or SSH if accessible. Version 9.0.2 is vulnerable.Check Version:
Check via web interface at http://<device_ip>/status or SSH if enabledVerify Fix Applied:
Verify device version has been updated beyond 9.0.2 when patch becomes available.📡 Detection & Monitoring
Log Indicators:
- Unusual password change attempts
- Unexpected shell command execution in system logs
- Multiple failed authentication attempts
Network Indicators:
- Unusual traffic to PLC management ports
- Command injection patterns in HTTP requests to password change endpoints
SIEM Query:
source="plc_logs" AND (event="password_change" OR event="system_command") AND status="success"