NTP BUG 3387: Authenticated DoS via Malicious Config Option

Last update: June 27, 2022 20:45 UTC (51d68a4aa)


Resolved 4.2.8p10 21 Mar 2017
References Bug 3387 CVE-2017-6463
Affects All versions of ntp, up to but not including ntp-4.2.8p10,
and ntp-4.3.0 up to, but not including ntp-4.3.94.
Resolved in 4.2.8p10.
CVSS2 Score MED 4.6 AV:N/AC:H/Au:M/C:N/I:N/A:C
CVSS3 Score MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H


A vulnerability found in the NTP server allows an authenticated remote attacker to crash the daemon by sending an invalid setting via the :config directive. The unpeer option expects a number or an address as an argument. In case the value is 0, a segmentation fault occurs.



This weakness was discovered by Cure53.