Rapid7 Vulnerability & Exploit Database

NTP.org ntpd Reserved Mode Denial of Service

Back to Search

NTP.org ntpd Reserved Mode Denial of Service



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!


  • todb <todb@metasploit.com>


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
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 

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security