ntpd in ntp before 4.2.8p3 with remote configuration enabled allows remote authenticated users with knowledge of the configuration password and access to a computer entrusted to perform remote configuration to cause a denial of service (service crash) via a NULL byte in a crafted configuration directive packet.
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169167.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-September/166992.html
https://bugzilla.redhat.com/show_bug.cgi?id=1238136
https://security.gentoo.org/glsa/201509-01
https://security.netapp.com/advisory/ntap-20180731-0003/