Cisco Network Registrar before 7.2 has a default administrative password, which makes it easier for remote attackers to obtain access via a TCP session, aka Bug ID CSCsm50627.
Cisco CNS Network Registrar Central Configuration Management (CCM) server 6.0 through 6.1.1.3 allows remote attackers to cause a denial of service (CPU consumption) by ending a connection after sending a certain sequence of packets.
The lock manager in Cisco CNS Network Registrar 6.0 through 6.1.1.3 allows remote attackers to cause a denial of service (process crash) via a certain "unexpected packet sequence."