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March 2019 ntp-4.2.8p13 NTP Release and Security Vulnerability Announcement
Published on June 13, 2019 by Steve Sobol

The NTP Project at Network Time Foundation publicly released ntp-4.2.8p13 on Thursday, 07 March 2019.

This release fixes one security issue in ntpd:

  • MEDIUM: Sec 3565: Crafted null dereference attack from a trusted source with an authenticated mode 6 packet
  • A crafted malicious authenticated mode 6 (ntpq) packet from a permitted network address can trigger a NULL pointer dereference, crashing ntpd. Note that for this attack to work, the sending system must be on an address that the target’s ntpd accepts mode 6 packets from, and must properly authenticate the packet with a private key that is specifically listed as being used for mode 6 authorization.
  • Reported by Magnus Stubman.

and provides 17 bugfixes and 1 other improvement.

E-notification of these issues were delivered to our Institutional members on a rolling basis as they were reported and as progress was made.


  • 2019 Mar 07: Public release
  • 2019 Feb 20: Release to Advance Security Partners
  • 2019 Jan 16: Notification to Institutional Members
  • 2019 Jan 15: Notification from reporter

– tarballs:

– BitKeeper:

– git: (Please note: the github synchronization and update process is not functioning and we could use some help there)