This indicates an attack attempt to exploit a Remote Code Execution in VMware vCenter.
The vulnerability is due to lack of input validation in the Virtual SAN Health Check plug-in. A remote attacker can exploit this to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server..
vCenter Server 6.5
vCenter Server 6.7
vCenter Server 7.0
Cloud Foundation (vCenter Server) 3.x
Cloud Foundation (vCenter Server) 4.x
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.