Port 123 - NTP

NTP DoS reflection attacks

ntpq -c rv <IP>
ntpdc -c sysinfo <IP>
ntpdc -n -c monlist <IP>

nmap -sU -pU:123 -Pn -n --script=ntp-monlist <IP>

Links

LogoNTP DoS reflection attacks – LITNET CERT
LogoNetwork Time Protocol (NTP): Threats and countermeasures | Infosec

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