NTP before 4.2.8p7 and 4.3.x before 4.3.92, when mode7 is enabled, allows remote attackers to cause a denial of service (ntpd abort) by using the same IP address multiple times in an unconfig directive.
Exploitability
AV:NAC:HPR:LUI:NScope
S:UImpact
C:NI:NA:H5.3/CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H