The present document provides a comprehensive security event classification model and associated taxonomy (based on
existing results and hands-on user experience), covering both security incidents and vulnerabilities. The two latter ones
become nonconformities when they violate an organization's security policy. The present document mainly supports
operational security staff in their effort to qualify and categorize detected security events, and more generally all
stakeholders (especially CISOs and IT security managers) in their needs to establish a common language.