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Fencer Intel
medium 6.8

CVE-2014-9751 json

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a sour…

published 11y ago modified 4mo ago also EUVD-2014-9557

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a source IP address is an IPv6 loopback address, which makes it easier for remote attackers to spoof restricted packets, and read or write to the runtime state, by leveraging the ability to reach the ntpd machine's network interface with a packet from the ::1 address.

Patch / fix

  • ntp ntp 4.2.8
  • ntp Debian 11 1:4.2.6.p5+dfsg-4

debian advisories DEBIAN-CVE-2014-9751

  • ntp RHEL 7 4.2.6p5-22.el7
  • sntp RHEL 7 4.2.6p5-22.el7
  • ntpdate RHEL 7 4.2.6p5-22.el7
  • ntp-perl RHEL 7 4.2.6p5-22.el7
  • ntp RHEL 6 4.2.6p5-5.el6
  • ntpdate RHEL 6 4.2.6p5-5.el6
  • ntp-perl RHEL 6 4.2.6p5-5.el6

red hat advisories RHSA-2015:2231RHSA-2015:1459

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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-2014-9751 updated cvss 5.0

ntp: drop packets with source address ::1

  • Red Hat Enterprise Linux 5 ntp
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) ntp 4.2.6p5-22.el7, ntpdate 4.2.6p5-22.el7 Red Hat Enterprise Linux Client Optional (v. 7) sntp 4.2.6p5-22.el7, ntp-perl 4.2.6p5-22.el7 Red Hat Enterprise Linux ComputeNode (v. 7) ntp 4.2.6p5-22.el7, ntpdate 4.2.6p5-22.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) sntp 4.2.6p5-22.el7, ntp-perl 4.2.6p5-22.el7
    fixed: vendor fix RHSA-2015:2231
  • Red Hat Enterprise Linux Desktop (v. 6) ntp 4.2.6p5-5.el6, ntpdate 4.2.6p5-5.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-perl 4.2.6p5-5.el6 Red Hat Enterprise Linux HPC Node (v. 6) ntp 4.2.6p5-5.el6, ntpdate 4.2.6p5-5.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-perl 4.2.6p5-5.el6 Red Hat Enterprise Linux Server (v. 6) ntp 4.2.6p5-5.el6, ntpdate 4.2.6p5-5.el6
    fixed: vendor fix RHSA-2015:1459
  • Red Hat Enterprise Linux Server (v. 7) ntp 4.2.6p5-22.el7, ntpdate 4.2.6p5-22.el7
    fixed: vendor fix RHSA-2015:2231
  • Red Hat Enterprise Linux Server Optional (v. 6) ntp-perl 4.2.6p5-5.el6
    fixed: vendor fix RHSA-2015:1459
  • Red Hat Enterprise Linux Server Optional (v. 7) sntp 4.2.6p5-22.el7, ntp-perl 4.2.6p5-22.el7
    fixed: vendor fix RHSA-2015:2231
  • Red Hat Enterprise Linux Workstation (v. 6) ntp 4.2.6p5-5.el6, ntpdate 4.2.6p5-5.el6
    fixed: vendor fix RHSA-2015:1459
  • Red Hat Enterprise Linux Workstation (v. 7) ntp 4.2.6p5-22.el7, ntpdate 4.2.6p5-22.el7
    fixed: vendor fix RHSA-2015:2231
show 2 more
  • Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-perl 4.2.6p5-5.el6
    fixed: vendor fix RHSA-2015:1459
  • Red Hat Enterprise Linux Workstation Optional (v. 7) sntp 4.2.6p5-22.el7, ntp-perl 4.2.6p5-22.el7
    fixed: vendor fix RHSA-2015:2231

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

4.53% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.