Rapid7’s 2026 Global Cybersecurity Summit is now available on-demand.Watch sessions.
Rapid7

module

NTP.org ntpd Reserved Mode Denial of Service

Disclosed
Oct 4, 2009
Created
May 30, 2018

Description

This module exploits a denial of service vulnerability
within the NTP (network time protocol) demon. By sending
a single packet to a vulnerable ntpd server (Victim A),
spoofed from the IP address of another vulnerable ntpd server
(Victim B), both victims will enter an infinite response loop.
Note, unless you control the spoofed source host or the real
remote host(s), you will not be able to halt the DoS condition
once begun!

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


msf > use auxiliary/dos/ntp/ntpd_reserved_dos
msf auxiliary(ntpd_reserved_dos) > show actions
...actions...
msf auxiliary(ntpd_reserved_dos) > set ACTION < action-name >
msf auxiliary(ntpd_reserved_dos) > show options
...show and set options...
msf auxiliary(ntpd_reserved_dos) > run

Title
Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.