CVE-2025-11780
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 devices. An attacker can exploit this by sending an excessively large 'meter' parameter to execute arbitrary code with system 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
Complete device compromise leading to remote code execution, potential lateral movement within industrial networks, and disruption of physical processes controlled by the PLC.
Likely Case
Remote code execution allowing attackers to manipulate PLC operations, disrupt industrial processes, or establish persistence in OT networks.
If Mitigated
Limited impact if devices are isolated in air-gapped networks with strict access controls, though risk remains if perimeter is breached.
🎯 Exploit Status
The vulnerability is straightforward to exploit due to lack of input validation and authentication requirements.
🛠️ 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 vendor announcements for firmware updates. 2. Apply firmware patches when available. 3. Restart affected PLC devices after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected PLC devices in dedicated network segments with strict firewall rules.
Access Control Restrictions
allImplement strict network access controls to limit connections to PLC devices to authorized management systems only.
🧯 If You Can't Patch
- Implement network segmentation to isolate PLC devices from untrusted networks
- Deploy intrusion detection systems monitoring for buffer overflow attempts on PLC network segments
🔍 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://[device-ip]/status or via serial console connectionVerify Fix Applied:
Verify firmware version has been updated to a version later than v9.0.2 after applying vendor patches.📡 Detection & Monitoring
Log Indicators:
- Unusually large parameter values in HTTP requests to PLC web interface
- Multiple failed buffer overflow attempts
Network Indicators:
- HTTP requests with abnormally long 'meter' parameter values to PLC devices
- Traffic patterns indicating buffer overflow exploitation attempts
SIEM Query:
source_ip="*" AND dest_ip="[PLC_IP]" AND http_uri="*meter=*" AND length(http_parameter_value) > 1000