nfsd in FreeBSD 6.0 kernel allows remote attackers to cause a denial of service via a crafted NFS mount request, as demonstrated by the ProtoVer NFS test suite.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24918
http://www.securityfocus.com/bid/16838
http://securityreason.com/securityalert/521
http://secunia.com/advisories/19017
http://lists.immunitysec.com/pipermail/dailydave/2006-February/002982.html