nfs-utils contains the client and daemon implementations for the NFS protocol.
Michele Marcionelli reported that nfs-utils invokes the hosts_ctl() function with the wrong order of arguments, which causes TCP Wrappers to ignore netgroups.
A remote attacker could bypass intended access restrictions, i.e. NFS netgroups, and gain access to restricted services.
There is no known workaround at this time.
All nfs-utils users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-fs/nfs-utils-1.1.3"