This indicates an attack attempt to exploit an Input Validation Error Vulnerability in Cisco Systems Cisco Security Manager (CSM).
The vulnerability is due to insufficient validation of requests to SecretService.jsp. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted serialized object. Successful exploitation can result in arbitrary code execution as root.
Cisco Systems Cisco Security Manager (CSM) 4.22 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.