FreeBSD -- Multiple vulnerabilities of ntp

Problem Description:
A vulnerability was discovered in the NTP server’s parsing
of configuration directives. [CVE-2017-6464]
A vulnerability was found in NTP, in the parsing of
packets from the DPTS Clock. [CVE-2017-6462]
A vulnerability was discovered in the NTP server’s parsing
of configuration directives. [CVE-2017-6463]
A vulnerability was found in NTP, affecting the origin
timestamp check function. [CVE-2016-9042]
Impact:
A remote, authenticated attacker could cause ntpd to
crash by sending a crafted message. [CVE-2017-6463,
CVE-2017-6464]
A malicious device could send crafted messages, causing
ntpd to crash. [CVE-2017-6462]
An attacker able to spoof messages from all of the
configured peers could send crafted packets to ntpd, causing
later replies from those peers to be discarded, resulting
in denial of service. [CVE-2016-9042]