CVE-2014-9751

Name: CVE-2014-9751
Creator: NVD / NIST
Published: 2015-10-06T01:59:02.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.53%

Last modified Jun 17, 2026

CVE-2014-9751 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.53% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

4.53%

90.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Ntp	Ntp	>= 4.2.0, < 4.2.8
Ntp	Ntp	4.2.8
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Workstation	6.0
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Oracle	Linux	7

References

http://bugs.ntp.org/show_bug.cgi?id=2672Issue Tracking, Patch, Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2015-1459.htmlThird Party Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_VulneVendor Advisory
http://www.debian.org/security/2015/dsa-3388Third Party Advisory
http://www.kb.cert.org/vuls/id/852879Third Party Advisory, US Government Resource
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.htmlThird Party Advisory
http://www.securityfocus.com/bid/72584Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1184572Issue Tracking, Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_usThird Party Advisory
http://bugs.ntp.org/show_bug.cgi?id=2672Issue Tracking, Patch, Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2015-1459.htmlThird Party Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_VulneVendor Advisory
http://www.debian.org/security/2015/dsa-3388Third Party Advisory
http://www.kb.cert.org/vuls/id/852879Third Party Advisory, US Government Resource
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.htmlThird Party Advisory
http://www.securityfocus.com/bid/72584Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1184572Issue Tracking, Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_usThird Party Advisory

Timeline

Published: Oct 6, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2014-9751?

How severe is CVE-2014-9751?

Severity scoring for CVE-2014-9751 is pending analysis. The EPSS model estimates a 4.53% probability of exploitation in the next 30 days.

How do I fix CVE-2014-9751?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2014-9751?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST