Improper neutralization of argument delimiters in a command in Nagios XI 5.7.3 allows a remote, authenticated admin user to write to arbitrary files and ultimately execute code with the privileges of the apache user.
https://www.tenable.com/security/research/tra-2020-58
http://packetstormsecurity.com/files/162284/Nagios-XI-5.7.3-Remote-Code-Execution.html