Skip to content
Fencer Intel
low 3.7

CVE-2016-7429 json

NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cau…

published 2017-01-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8282

cvss
3.7
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.4%
EPSS 7.4% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • ntp Debian 11 1:4.2.8p9+dfsg-1

debian advisories DEBIAN-CVE-2016-7429

  • ntp Ubuntu 14.04 LTS 1:4.2.6.p5+dfsg-3ubuntu2.14.04.11
  • ntp Ubuntu 16.04 LTS 1:4.2.8p4+dfsg-3ubuntu5.5

ubuntu advisories UBUNTU-CVE-2016-7429

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ntp RHEL 6 4.2.6p5-10.el6_8.2
  • ntp RHEL 7 4.2.6p5-25.el7_3.1
  • sntp RHEL 7 4.2.6p5-25.el7_3.1
  • ntpdate RHEL 6 4.2.6p5-10.el6_8.2
  • ntpdate RHEL 7 4.2.6p5-25.el7_3.1
  • ntp-perl RHEL 6 4.2.6p5-10.el6_8.2
  • ntp-perl RHEL 7 4.2.6p5-25.el7_3.1

red hat advisories RHSA-2017:0252

  • ntp SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLES 11 SP2-LTSS +4 more 4.2.8p9-48.9.1
  • ntp SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +4 more 4.2.8p9-55.1
  • ntp SLES for SAP 11 SP4, SLES 11 SP4 4.2.8p9-57.2
  • ntp SLES for SAP 12, SLES 12-LTSS 4.2.8p9-46.18.1

suse advisories SUSE-SU-2017:0255-1SUSE-SU-2016:3195-1SUSE-SU-2016:3196-1SUSE-SU-2016:3193-1

  • ntp openSUSE Tumbleweed 4.2.8p9-1.1

opensuse advisories openSUSE-SU-2024:10181-1

  • ntp Arch Linux 4.2.8.p9-1

arch linux advisories AVG-79AVG-80

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-7429 updated cvss 3.7

ntp: Attack on interface selection

  • Red Hat Enterprise Linux 5 ntp
    affected: workaround, no fix planned “If you are going to configure your OS to disable source address checks, also configure your firewall configuration to control what interfaces can receive packets from what networks.”
  • Red Hat Enterprise Linux Client (v. 7) ntp 4.2.6p5-25.el7_3.1, ntpdate 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux Client Optional (v. 7) sntp 4.2.6p5-25.el7_3.1, ntp-perl 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux ComputeNode (v. 7) ntp 4.2.6p5-25.el7_3.1, ntpdate 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) sntp 4.2.6p5-25.el7_3.1, ntp-perl 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux Desktop (v. 6) ntp 4.2.6p5-10.el6_8.2, ntpdate 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-perl 4.2.6p5-10.el6_8.2
    +10 more products
    Red Hat Enterprise Linux HPC Node (v. 6) ntp 4.2.6p5-10.el6_8.2, ntpdate 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-perl 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Server (v. 6) ntp 4.2.6p5-10.el6_8.2, ntpdate 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Server (v. 7) ntp 4.2.6p5-25.el7_3.1, ntpdate 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux Server Optional (v. 6) ntp-perl 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Server Optional (v. 7) sntp 4.2.6p5-25.el7_3.1, ntp-perl 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux Workstation (v. 6) ntp 4.2.6p5-10.el6_8.2, ntpdate 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Workstation (v. 7) ntp 4.2.6p5-25.el7_3.1, ntpdate 4.2.6p5-25.el7_3.1 Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-perl 4.2.6p5-10.el6_8.2 Red Hat Enterprise Linux Workstation Optional (v. 7) sntp 4.2.6p5-25.el7_3.1, ntp-perl 4.2.6p5-25.el7_3.1
    fixed: vendor fix “If you are going to configure your OS to disable source address checks, also configure your firewall configuration to control what interfaces can receive packets from what networks.” RHSA-2017:0252

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.36% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-18 DEPRECATED: Source Code

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.