ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of service (memory consumption) by sending packets, because memory is not freed in situations where a CMAC key is used and associated with a CMAC algorithm in the ntp.keys file.
lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html
lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html
bugs.gentoo.org/729458
security.gentoo.org/glsa/202007-12
security.netapp.com/advisory/ntap-20200702-0002/
support.ntp.org/bin/view/Main/NtpBug3661
support.ntp.org/bin/view/Main/SecurityNotice
www.oracle.com/security-alerts/cpujan2021.html