CVE-2025-11778
📋 TL;DR
A stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v0.9.2 allows remote attackers to execute arbitrary code through memory corruption in the TACACSPLUS implementation. This affects industrial control systems using these specific PLC models, potentially compromising critical infrastructure operations.
💻 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 disruption of industrial processes or safety systems.
Likely Case
Remote code execution allowing attackers to manipulate PLC operations, modify control logic, or establish persistence in industrial networks.
If Mitigated
Limited impact if devices are isolated behind firewalls with strict network segmentation and access controls.
🎯 Exploit Status
Buffer overflow vulnerabilities in network services typically have low exploitation complexity once details are understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided reference
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 website for security updates. 2. Apply firmware patches when available. 3. Restart affected devices after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected PLCs from untrusted networks using firewalls and VLANs.
Access Control Lists
allImplement strict network ACLs to limit access to TACACSPLUS service (typically port 49).
🧯 If You Can't Patch
- Segment affected devices into isolated network zones with no internet access
- Implement intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or serial console. If version is v0.9.2, device is vulnerable.Check Version:
Check via device web interface or manufacturer documentation for version query methods.Verify Fix Applied:
Verify firmware version has been updated to a version later than v0.9.2.📡 Detection & Monitoring
Log Indicators:
- Unusual TACACSPLUS connection attempts
- Memory access violations in system logs
- Unexpected device reboots
Network Indicators:
- Unusual traffic to port 49 (TACACSPLUS)
- Malformed packets to PLC network services
SIEM Query:
source_ip:* AND dest_port:49 AND (packet_size:>normal OR protocol_anomaly:true)