SCO Security Advisory – When the RPC portmapper (rpcbind) receives an invalid portmap request from a remote (or local) host, it falls into a denial of service state and cannot respond. As a result, the RPC services will not operate normally.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/41076/SCOSA-2005.43.txt
Source: https://packetstormsecurity.com/files/41076/SCOSA-2005.43.txt.html