Net-Server, when the reverse-lookups option is enabled, does not check if the hostname resolves to the source IP address, which might allow remote attackers to bypass ACL restrictions via the hostname parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/82900
https://bugzilla.redhat.com/show_bug.cgi?id=920683
http://www.securityfocus.com/bid/58309