Vulnerability Monitor

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CVE-2016-2518

The MATCH_ASSOC function in NTP before version 4.2.8p9 and 4.3.x before 4.3.92 allows remote attackers to cause an out-of-bounds reference via an addpeer request with a large hmode value.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and limited availability for affected systems. Impacting 18 products from ntp, from debian, from netapp and 15 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-01-30T21:59:01.080

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-125

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	ntp	ntp	< 4.2.8	Yes
Application	ntp	ntp	< 4.3.92	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Application	ntp	ntp	4.2.8	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	debian	debian_linux	10.0	Yes
Application	netapp	clustered_data_ontap	-	Yes
Application	netapp	data_ontap	-	Yes
Application	netapp	oncommand_balance	-	Yes
Application	netapp	oncommand_performance_manager	-	Yes
Application	netapp	oncommand_unified_manager_for_clustered_data_ontap	-	Yes
Application	oracle	communications_user_data_repository	10.0.0	Yes
Application	oracle	communications_user_data_repository	10.0.1	Yes
Application	oracle	communications_user_data_repository	12.0.0	Yes
Operating System	oracle	linux	6	Yes
Operating System	oracle	linux	7	Yes
Operating System	redhat	enterprise_linux_desktop	7.0	Yes
Operating System	redhat	enterprise_linux_server	6.0	Yes
Operating System	redhat	enterprise_linux_server	7.0	Yes
Operating System	redhat	enterprise_linux_server_aus	7.2	Yes
Operating System	redhat	enterprise_linux_server_aus	7.4	Yes
Operating System	redhat	enterprise_linux_server_aus	7.6	Yes
Operating System	redhat	enterprise_linux_server_eus	7.2	Yes
Operating System	redhat	enterprise_linux_server_eus	7.3	Yes
Operating System	redhat	enterprise_linux_server_eus	7.4	Yes
Operating System	redhat	enterprise_linux_server_eus	7.5	Yes
Operating System	redhat	enterprise_linux_server_eus	7.6	Yes
Operating System	redhat	enterprise_linux_server_eus	7.7	Yes
Operating System	redhat	enterprise_linux_server_tus	7.2	Yes
Operating System	redhat	enterprise_linux_server_tus	7.3	Yes
Operating System	redhat	enterprise_linux_server_tus	7.6	Yes
Operating System	redhat	enterprise_linux_server_tus	7.7	Yes
Operating System	redhat	enterprise_linux_workstation	6.0	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	9.3	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.1	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.2	Yes
Operating System	freebsd	freebsd	10.3	Yes
Operating System	siemens	simatic_net_cp_443-1_opc_ua_firmware	*	Yes
Hardware	siemens	simatic_net_cp_443-1_opc_ua	-	No

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html ([email protected])
http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html ([email protected])
http://rhn.redhat.com/errata/RHSA-2016-1552.html Broken Link ([email protected])
http://support.ntp.org/bin/view/Main/NtpBug3009 Vendor Advisory ([email protected])
http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_ntp_4_2_8p7_Security Vendor Advisory ([email protected])
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd ([email protected])
http://www.debian.org/security/2016/dsa-3629 Third Party Advisory ([email protected])
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html Patch, Third Party Advisory ([email protected])
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html Third Party Advisory ([email protected])
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html Third Party Advisory ([email protected])
http://www.securityfocus.com/archive/1/538233/100/0/threaded ([email protected])
http://www.securityfocus.com/archive/1/archive/1/538233/100/0/threaded ([email protected])
http://www.securityfocus.com/bid/88226 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1035705 Third Party Advisory, VDB Entry ([email protected])
http://www.ubuntu.com/usn/USN-3096-1 ([email protected])
https://access.redhat.com/errata/RHSA-2016:1141 Third Party Advisory ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf Third Party Advisory ([email protected])
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201607-15 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20171004-0002/ Third Party Advisory ([email protected])
https://support.f5.com/csp/article/K20804323 ([email protected])
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 ([email protected])
https://www.debian.org/security/2016/dsa-3629 ([email protected])
https://www.kb.cert.org/vuls/id/718152 Third Party Advisory, US Government Resource ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html (af854a3a-2127-422b-91ae-364da2661108)
http://rhn.redhat.com/errata/RHSA-2016-1552.html Broken Link (af854a3a-2127-422b-91ae-364da2661108)
http://support.ntp.org/bin/view/Main/NtpBug3009 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_ntp_4_2_8p7_Security Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2016/dsa-3629 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/archive/1/538233/100/0/threaded (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/archive/1/archive/1/538233/100/0/threaded (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/88226 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1035705 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/USN-3096-1 (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/errata/RHSA-2016:1141 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201607-15 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20171004-0002/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/csp/article/K20804323 (af854a3a-2127-422b-91ae-364da2661108)
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2016/dsa-3629 (af854a3a-2127-422b-91ae-364da2661108)
https://www.kb.cert.org/vuls/id/718152 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For ntp's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.