This indicates an attack attempt to exploit a Remote Code Execution vulnerability in Merethis Centreon.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the 'command_name' parameter of the application. As a result, a remote attacker may be able to execute arbitrary code within the context of the application.
Centreon Centreon 2.3.1 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems
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