CVE-2025-55069
📋 TL;DR
A predictable seed in the pseudo-random number generator in Click Plus PLC firmware version 3.60 allows attackers to predict generated private keys. This compromises cryptographic security, potentially enabling unauthorized access or data manipulation. Organizations using affected PLCs in industrial control systems are at risk.
💻 Affected Systems
- Click Plus PLC
⚠️ 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 compromise of PLC security allowing unauthorized control of industrial processes, data theft, or manipulation of critical infrastructure operations.
Likely Case
Unauthorized access to PLC systems leading to operational disruption, data exfiltration, or manipulation of industrial processes.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to vulnerable systems.
🎯 Exploit Status
Exploitation requires understanding of the predictable seed pattern but does not require authentication to the PLC.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://www.automationdirect.com/support/software-downloads
Restart Required: Yes
Instructions:
1. Check vendor advisory for patched firmware version. 2. Download updated firmware from vendor site. 3. Backup PLC configuration. 4. Apply firmware update following vendor instructions. 5. Restart PLC. 6. Verify firmware version.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs from untrusted networks and internet access
Access Control Restrictions
allImplement strict access controls to limit who can communicate with PLCs
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable PLCs from untrusted networks
- Monitor network traffic to/from PLCs for suspicious cryptographic operations
🔍 How to Verify
Check if Vulnerable:
Check PLC firmware version via programming software or HMI interfaceCheck Version:
Use Click programming software to read PLC firmware versionVerify Fix Applied:
Verify firmware version has been updated to patched version📡 Detection & Monitoring
Log Indicators:
- Unusual cryptographic operations
- Unauthorized access attempts to PLC
Network Indicators:
- Suspicious traffic patterns to PLC ports
- Unexpected cryptographic protocol usage
SIEM Query:
source_ip=PLC_IP AND (protocol=cryptographic OR port=502) AND event_type=anomaly