CVE-2025-11785
📋 TL;DR
A stack-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 running vulnerable firmware versions, potentially compromising PLC devices used in energy management and automation.
💻 Affected Systems
- Circutor SGE-PLC1000
- Circutor SGE-PLC50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution, allowing attackers to manipulate industrial processes, disrupt operations, or pivot to other network segments.
Likely Case
Remote code execution leading to PLC device compromise, potential process manipulation, and data exfiltration from industrial networks.
If Mitigated
Denial of service or limited information disclosure if exploit attempts are detected and blocked by network controls.
🎯 Exploit Status
The vulnerability is straightforward to exploit due to lack of input validation and buffer size checking. Attackers can craft malicious meter parameter values.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with Circutor for updated firmware
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0
Restart Required: Yes
Instructions:
1. Contact Circutor for updated firmware. 2. Backup current configuration. 3. Apply firmware update via web interface or console. 4. Restart device. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLC devices in separate VLANs with strict firewall rules limiting access to necessary IPs only.
Input Validation Proxy
allDeploy a reverse proxy that validates and sanitizes meter parameter length before forwarding to PLC.
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted management stations to communicate with PLC web interface.
- Deploy intrusion detection systems monitoring for buffer overflow attempts and abnormal meter parameter values.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at /status or console. If version is v9.0.2, device is vulnerable.Check Version:
curl -k https://<plc-ip>/status | grep FirmwareVerify Fix Applied:
After patching, verify firmware version is updated and test with controlled buffer overflow attempts.📡 Detection & Monitoring
Log Indicators:
- Unusually long meter parameter values in web server logs
- Multiple failed authentication attempts followed by buffer overflow patterns
Network Indicators:
- HTTP requests with meter parameter exceeding 1000 characters
- Abnormal traffic patterns to PLC web interface
SIEM Query:
source="plc_web_logs" AND (meter_parameter_length>1000 OR "sprintf" IN error_message)