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CVE-2014-9751

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X...

6.8 MediumFix available

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.

Exploit likelihood

4.53%Up 2.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 6.8

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.

Record
CVE-2014-9751
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2014-9751
Updated
2026-11-02
EUVDEUVD-2014-9557 No score

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.

Record
EUVD-2014-9557
Updated
2026-11-03
GitHub AdvisoriesGHSA-ffj6-rf7h-c479 No score

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X...

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.

Record
GHSA-ffj6-rf7h-c479
Weakness
CWE-20
Updated
2026-11-02
OSV No score

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.

Record
CVE-2014-9751
Updated
2026-11-02
OSVDEBIAN-CVE-2014-9751 No score

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.

Record
DEBIAN-CVE-2014-9751
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ntp
Debian:11
 before 1:4.2.6.p5+dfsg-4
1:4.2.6.p5+dfsg-4
ntp
Debian:6.0
From an advisory covering 2 CVEs
 before 1:4.2.6.p2+dfsg-1+deb6u2, plus listed versions
1:4.2.6.p2+dfsg-1
1:4.2.6.p2+dfsg-1+deb6u2
ntp
Debian:7
From an advisory covering 2 CVEs
 before 1:4.2.6.p5+dfsg-2+deb7u2, plus listed versions
1:4.2.6.p5+dfsg-21:4.2.6.p5+dfsg-2+deb7u1
1:4.2.6.p5+dfsg-2+deb7u2
ntp-debuginfo
Red Hat:enterprise_linux:6::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-doc
Red Hat:enterprise_linux:6::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-perl
Red Hat:enterprise_linux:6::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp
Red Hat:enterprise_linux:6::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntpdate
Red Hat:enterprise_linux:6::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-debuginfo
Red Hat:enterprise_linux:6::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-doc
Red Hat:enterprise_linux:6::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
Show 37 moreShow less
Affected packages
PackageAffectedFixed
ntp-perl
Red Hat:enterprise_linux:6::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp
Red Hat:enterprise_linux:6::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntpdate
Red Hat:enterprise_linux:6::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-debuginfo
Red Hat:enterprise_linux:6::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-doc
Red Hat:enterprise_linux:6::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-perl
Red Hat:enterprise_linux:6::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp
Red Hat:enterprise_linux:6::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntpdate
Red Hat:enterprise_linux:6::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-debuginfo
Red Hat:enterprise_linux:6::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-doc
Red Hat:enterprise_linux:6::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-perl
Red Hat:enterprise_linux:6::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp
Red Hat:enterprise_linux:6::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntpdate
Red Hat:enterprise_linux:6::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-5.el6
0:4.2.6p5-5.el6
ntp-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-doc
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-perl
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
sntp
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntpdate
Red Hat:enterprise_linux:7::client
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-doc
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-perl
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
sntp
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntpdate
Red Hat:enterprise_linux:7::computenode
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-doc
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-perl
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
sntp
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntpdate
Red Hat:enterprise_linux:7::server
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-doc
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp-perl
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
sntp
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntp
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7
ntpdate
Red Hat:enterprise_linux:7::workstation
From an advisory covering 7 CVEs
 before 0:4.2.6p5-22.el7
0:4.2.6p5-22.el7

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2014-9751 is a medium vulnerability (CVSS 6.8) in Debian Linux, published February 5, 2015. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.53%, the 91st percentile. Fixed in ntp 1:4.2.6.p5+dfsg-4.

References

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