Buffer overflow in Hikvision DVR DS-7204 Firmware 2.2.10 build 131009, and other models and versions, allows remote attackers to execute arbitrary code via an RTSP PLAY request with a long Authorization header.
https://github.com/sylhetyhackvenger/HIKRAVEN
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-4799
http://www.exploit-db.com/exploits/35356
http://packetstormsecurity.com/files/129187/Hikvision-DVR-RTSP-Request-Remote-Code-Execution.html