This indicates an attack attempt against an Information Disclosure vulnerability in Cisco Systems Prime Data Center Network Manager.
The vulnerability is due to insufficient input validation when vulnerable module handles a crafted HTTP request. A remote attacker can exploit this to gain unauthorized access to sensitive information via a crafted HTTP request.
Cisco Systems Prime Data Center Network Manager Prior to 6.2
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.