This indicates an attack attempt to exploit an Insecure Deserialization Vulnerability in Cisco Systems Unified Contact Center Express (UCCX).
This vulnerability is due to deserialization of untrusted data. 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 Unified Contact Center Express (UCCX) prior to 12.0(1)ES03
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.