N5013 37X V1.00_STD-1
N5071 V1.02 STD-1, V1.03_STD-1
While looking at the information on the cameras I found a changelog for the N5071 1.03 STD-1 release that may indicate a remote denial of service being fixed:
Version: V1.03 STD-1
Release Date: 2012/06/19
Fix bug which system will reboot if streaming reconnect very often.