HOMEVULNERABILITIESCVE-2014-9751
MEDIUM

CVE-2014-9751

CWE-20Published: October 6, 2015· Updated: Jun 17, 2026

6.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2014-9751 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityP
IntegrityP
AvailabilityP
AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected Vendors & Products

Apple1 product(s)
macos
Debian1 product(s)
debian linux
Linux1 product(s)
linux kernel
ntp1 product(s)
ntp
Oracle1 product(s)
linux
Red Hat3 product(s)
enterprise linux desktopenterprise linux serverenterprise linux workstation
Source: NVD CPE · 11 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://bugs.ntp.org/show_bug.cgi?id=2672
PATCHhttp://bugs.ntp.org/show_bug.cgi?id=2672
ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1459.html
ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_Vulne
ADVISORYhttp://www.debian.org/security/2015/dsa-3388
ADVISORYhttp://www.kb.cert.org/vuls/id/852879
ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
ADVISORYhttp://www.securityfocus.com/bid/72584
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1184572
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us
ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1459.html
ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_Vulne
ADVISORYhttp://www.debian.org/security/2015/dsa-3388
ADVISORYhttp://www.kb.cert.org/vuls/id/852879
ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
ADVISORYhttp://www.securityfocus.com/bid/72584
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1184572
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us

All References (18)

→
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

Quick Facts

CVE IDCVE-2014-9751
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected6 vendor(s)
PublishedOct 6, 2015

Related CVEs (CWE-20)

CVE-2011-4755
10.0
CVE-2025-34105
10.0
CVE-2026-34910
KEV10.0
CVE-2025-34060
10.0
CVE-2009-1300
10.0
CVE-2008-1157
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2014-9751 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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