4.2.8p6 Release Announcement

Last update: September 3, 2026 14:42 UTC (1eec487e7)

NTF’s NTP Project has been notified of the following low- and medium-severity vulnerabilities that are fixed in ntp-4.2.8p6, released on Tuesday, 19 January 2016:

• 2948: Potential Infinite Loop in ntpq / CVE-2015-8158
  • Reported by Cisco ASIG
• 2945: origin: Zero Origin Timestamp Bypass / CVE-2015-8138
  • Reported by Cisco ASIG
• 2942: Off-path Denial of Service (DoS) attack on authenticated broadcast mode / CVE-2015-7979
  • Reported by Cisco ASIG
• 2940: Stack exhaustion in recursive traversal of restriction list / CVE-2015-7978
  • Reported by Cisco ASIG
• 2939: reslist NULL pointer dereference / CVE-2015-7977
  • Reported by Cisco ASIG
• 2938: ntpq saveconfig command allows dangerous characters in filenames / CVE-2015-7976
  • Reported by Cisco ASIG
• 2937: nextvar() missing length check / CVE-2015-7975
  • Reported by Cisco ASIG
• 2936: Skeleton Key: Missing key check allows impersonation between authenticated peers / CVE-2015-7974
  • Reported by Cisco ASIG
• 2935: Deja Vu: Replay attack on authenticated broadcast mode / CVE-2015-7973
  • Reported by Cisco ASIG.

Additionally, mitigations are published for the following two issues:

• 2947: ntpq vulnerable to replay attacks / CVE-2015-8140
  • Reported by Cisco ASIG
• 2946: Origin Leak: ntpq and ntpdc, disclose origin / CVE-2015-8139
  • Reported by Cisco ASIG, discovered by Boston University

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Timeline:

• 2016 Jan 19: Public release
• 2016 Jan 18: CERT notified and pre-release patch availability announced to CERT
• 2016 Jan 17: Early Access Program Release: Premier and Partner Institutional Members
• 2015 Nov 23: CVE numbers requested from Mitre
• 2015 Nov 5: Notification to Institutional Members
• 2016 Oct 16: Initial notification from Cisco; analysis begins