Zhuhai RaySharp firmware has a hardcoded root password, which makes it easier for remote attackers to obtain access via a session on TCP port 23 or 9000.
console-cowboys.blogspot.com/2013/01/swann-song-dvr-insecurity.html
seclists.org/bugtraq/2015/Jun/117
www.forbes.com/sites/andygreenberg/2013/01/28/more-than-a-dozen-brands-of-security-camera-systems-vulnerable-to-hacker-hijacking/
www.kb.cert.org/vuls/id/899080
www.kb.cert.org/vuls/id/923388
community.rapid7.com/community/metasploit/blog/2013/01/23/ray-sharp-cctv-dvr-password-retrieval-remote-root