Cisco firepower management centre was found to have vulnerabilities such as multiple CSS issues. This was mainly caused by its inability to properly sanitise user inputs. This issue could easily be misused by any attacker to steal credentials and launch various attacks.The vulnerable centres were identified as Cisco FirePOWER Management Center 6.5,Cisco FirePOWER Management Center 6.4 ,Cisco FirePOWER Management Center 6.3,Cisco FirePOWER Management Center 6.2.3.