An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctl_getitem, there is a stack-based buffer over-read in read_sysvars in ntp_control.c in ntpd.
https://www.exploit-db.com/exploits/46175/
https://github.com/ntpsec/ntpsec/blob/NTPsec_1_1_3/NEWS