PHP2Shell security problem did not affect CASUS, because backend not in PHP, CASUS Moodle and satellite tools were shortly off and updated short after 4pm Oct 21st. apologize for any inconvenience!
Regular Server Maintainance each Friday 7-8am CET/CEST (critical security maintainance would be performed inbetween), usually we expect only minor downtime and apologize for any inconvenience!