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.
The remote host is vulnerable to an flaw that allows attackers to execute arbitrary commands.
You are running a version of MySQL 4.1.x which is older than version 4.1.5. There is a flaw in the remote version of this software that may allow an attacker to execute arbitrary commands on the remote host with the privileges of the user running the mysqld process (typically 'mysql').