The server in CA ARCserve Backup r12.5, r15, and r16 on Windows does not properly process RPC requests, which allows remote attackers to execute arbitrary code or cause a denial of service via a crafted request.
http://packetstormsecurity.com/files/119543/Security-Notice-For-CA-ARCserve-Backup.html
http://seclists.org/fulldisclosure/2013/Jan/86
http://secunia.com/advisories/51012