NETWORK TIME PROTOCOL EPHEMERAL ASSOCIATION TIME SPOOFING VULNERABILITY
The MITRE CVE dictionary describes this issue as:
A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim’s clock.
CVSSv2: 3.5 – (AV:N/AC:M/Au:S/C:N/I:P/A:N)
CVSSv3: 5.3 – CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Assure only trusted hosts have access to the trustedkey