Abstract
This report is the third of three summary reports from the cybersecurity barrier management project. It summarizes new knowledge and guidance on the handling of cybersecurity threats, vulnerabilities and barrier impairments, covering the following activities:
i) Monitoring of cybersecurity barriers
ii) External threat intelligence to maintain cybersecurity barriers
iii) Handling of cybersecurity barriers
The other two reports cover technical and non-technical cybersecurity barriers. 
All three reports are summarized in a fourth report – a guidance document.