This indicates an attack attempt against a command-execution vulnerability in Oracle WebLogic Server Node Manager.
The vulnerability is caused by an error when the vulnerable software handles a malicious vector. It allows a remote attacker to execute arbitrary code via sending a crafted request.
Oracle WebLogic Server 7.0 SP7, 8.1 SP6, 9.0, 9.1, 9.2 MP3, 10.0 MP2, and 10.3.2
System Compromise: Remote attackers can gain control of vulnerable systems
Apply the patch supplied by the vendor: