This indicates an attack attempt to exploit a Command Injection vulnerability in Opsview Monitor.
The vulnerability is due to insufficient validation of user supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary OS commands within the context of the application, via a crafted HTTP request.
Opsview Monitor 5.4
Opsview Monitor 5.3
Opsview Monitor 5.2
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.