CVE-2025-11781
📋 TL;DR
This vulnerability allows attackers with local access to extract a hardcoded cryptographic key from Circutor SGE-PLC1000/SGE-PLC50 devices. Using this key, they can create valid firmware update packages that bypass all access controls and gain full administrative privileges. Organizations using these specific industrial control system devices are affected.
💻 Affected Systems
- Circutor SGE-PLC1000
- Circutor SGE-PLC50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems, allowing attackers to install malicious firmware, disrupt operations, manipulate physical processes, and maintain persistent access.
Likely Case
Local attackers gaining administrative access to modify device configurations, disrupt operations, or use devices as footholds into industrial networks.
If Mitigated
Limited impact if devices are physically secured and network segmentation prevents lateral movement from compromised devices.
🎯 Exploit Status
Requires local access to extract key from firmware/memory, but once obtained, creating malicious firmware packages is straightforward.
🛠️ 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 firmware updates and apply immediately when released.
🔧 Temporary Workarounds
Physical Access Control
allRestrict physical access to devices to prevent attackers from extracting firmware or accessing device memory.
Network Segmentation
allIsolate affected devices in separate network segments to limit lateral movement if compromised.
🧯 If You Can't Patch
- Implement strict physical security controls around all affected devices
- Monitor for unauthorized firmware update attempts and network traffic from these devices
🔍 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 device web interface or use serial console commands specific to Circutor devicesVerify Fix Applied:
Verify firmware version has been updated to a version beyond v9.0.2 when vendor releases patch.📡 Detection & Monitoring
Log Indicators:
- Unauthorized firmware update attempts
- Authentication bypass events
- Unexpected device reboots
Network Indicators:
- Unexpected firmware update traffic
- Unauthorized administrative access to device management interfaces
SIEM Query:
Search for firmware update events from Circutor devices outside maintenance windows or from unauthorized sources