The host is running RPC rusersd service and is prone to user name enumeration vulnerability.
Successful exploitation could allow attackers to extract the list of users currently logged in. Impact Level: System/Application
No solution or patch was made available for at least one year since disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one.
The flaw is due to an error in remote rusers server which allows to extract the list of users currently logged in the remote host.
nfs-utils rpc version 1.2.3 prior.