CVE-2025-11788
📋 TL;DR
A heap-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 allows remote code execution by sending an excessively large 'meter' parameter. This affects industrial control systems using these specific PLC models, potentially enabling attackers to take full control of the device.
💻 Affected Systems
- Circutor SGE-PLC1000
- Circutor SGE-PLC50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to remote code execution, device takeover, and potential lateral movement within industrial networks.
Likely Case
Remote code execution allowing attackers to manipulate PLC operations, disrupt industrial processes, or establish persistence.
If Mitigated
Limited impact if devices are isolated in air-gapped networks with strict input validation at perimeter controls.
🎯 Exploit Status
Direct buffer overflow via user-controlled input suggests straightforward exploitation once details are public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0
Restart Required: Yes
Instructions:
1. Monitor Circutor for firmware updates. 2. Apply vendor-provided patches when available. 3. Restart affected PLC devices after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected PLCs in dedicated industrial network segments with strict firewall rules.
Input Validation Proxy
allDeploy a proxy that validates and sanitizes all 'meter' parameter inputs before reaching the PLC.
🧯 If You Can't Patch
- Implement strict network access controls to limit communication to trusted sources only.
- Monitor network traffic for anomalous parameter sizes in requests to the vulnerable function.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or serial console; if version is v9.0.2, device is vulnerable.Check Version:
Check via web interface at http://<PLC_IP>/status or via serial console using vendor-specific commands.Verify Fix Applied:
Verify firmware version has been updated to a patched release from Circutor.📡 Detection & Monitoring
Log Indicators:
- Unusually large parameter values in HTTP requests
- Multiple failed buffer overflow attempts
- Unexpected process crashes or restarts
Network Indicators:
- HTTP requests with meter parameter exceeding normal size (e.g., >1000 characters)
- Traffic patterns indicating exploitation attempts
SIEM Query:
source="plc_logs" AND (meter_parameter_length>1000 OR buffer_overflow_detected)