CA ARCserver Backup r12 SP1 suffers from a denial of service vulnerability when a crafted RPC packet is sent to the Message engine service listening on the 6503/TCP port.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/78434/IVIZ-09-004.txt
Source: https://packetstormsecurity.com/files/78434/CA-ARCserver-Denial-Of-Service.html