The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
Nessus crawled the remote website.
This script makes a mirror of the remote website(s) and extracts the list of CGIs that are used by the remote host. It is suggested that you change the number of pages to mirror in the 'Options' section of the client.