CVE-2025-11043
📋 TL;DR
An improper certificate validation vulnerability in OPC-UA and ANSL over TLS clients in Automation Studio allows attackers to intercept and manipulate data exchanges. This affects Automation Studio versions before 6.5, potentially impacting industrial control systems using these communication protocols.
💻 Affected Systems
- Automation Studio
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete interception and manipulation of industrial control data leading to process disruption, equipment damage, or safety incidents
Likely Case
Data interception allowing reconnaissance, data theft, or injection of false data into industrial processes
If Mitigated
Limited impact due to network segmentation and proper certificate validation
🎯 Exploit Status
Man-in-the-middle position required on network path between clients
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5 or later
Vendor Advisory: https://www.br-automation.com/fileadmin/SA25P004-4f45197f.pdf
Restart Required: Yes
Instructions:
1. Download Automation Studio 6.5 or later from BR Automation website
2. Install the update following vendor instructions
3. Restart affected systems and applications
🔧 Temporary Workarounds
Network Segmentation
allIsolate Automation Studio systems from untrusted networks
Certificate Pinning
allConfigure clients to only accept specific trusted certificates
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Automation Studio systems
- Use VPN tunnels for all OPC-UA and ANSL over TLS communications
🔍 How to Verify
Check if Vulnerable:
Check Automation Studio version in Help > About menuCheck Version:
Not applicable - check via GUIVerify Fix Applied:
Verify version is 6.5 or later and test certificate validation📡 Detection & Monitoring
Log Indicators:
- Certificate validation failures
- Unexpected connection resets
Network Indicators:
- Unusual TLS handshake patterns
- MITM detection alerts
SIEM Query:
source="automation_studio" AND (event_type="certificate_error" OR event_type="connection_reset")