CVE-2016-7429

Publication date 13 January 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cause a denial of service (prevent communication with a source) by sending a response for a source to an interface the source does not use.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ntp	17.04 zesty	Not affected
	16.10 yakkety	Fixed 1:4.2.8p8+dfsg-1ubuntu2.1
	16.04 LTS xenial	Fixed 1:4.2.8p4+dfsg-3ubuntu5.5
	14.04 LTS trusty	Fixed 1:4.2.6.p5+dfsg-3ubuntu2.14.04.11
	12.04 LTS precise	Not affected

Notes

mdeslaur

ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and ntp-4.3.0 up to, but not including ntp-4.3.94

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ntp	Vendor: https://git.centos.org/blob/rpms!ntp.git/4eb1db127a6177011bd913bf4f446e8f701179d6/SOURCES!ntp-4.2.6p5-cve-2016-7429.patch Upstream: http://bk1.ntp.org/ntp-stable/?PAGE=cset&REV=57d78deeyfknMUHpF4CWmP8gRRf6qg Upstream: http://bk1.ntp.org/ntp-stable/?PAGE=cset&REV=57ef749cgdfwOxXsUdn3G64d0KIoUQ Upstream: http://bk1.ntp.org/ntp-stable/?PAGE=cset&REV=58662b53ZwV8BJejPYblqOussZZZ_w

Severity score breakdown

Parameter	Value
Base score	3.7 · Low
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L