Current version in EPEL is 2.0.3. Updates to 2.1.4 contain security fixes and improvements for using TLS in monitoring plugins.
nagios-plugins-2.1.4-2.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-17165c490b
nagios-plugins-2.1.4-2.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.