Unknown vulnerability in rpc.mountd in SGI IRIX 6.5.25, 6.5.26, and 6.5.27 does not sufficiently restrict access rights for read-mostly exports, which allows attackers to conduct unauthorized activities.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0140
http://www.vupen.com/english/advisories/2005/0702