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.
It was possible to identify the remote operating system based on the SNMP data returned.
Nessus was able to identify the operating system type and version by examining the SNMP data returned by the remote server.