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CVE-2016-1547 Details

Description

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://rhn.redhat.com/errata/RHSA-2016-1552.html	CVE
https://access.redhat.com/errata/RHSA-2016:1141	CVE
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf	CVE
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf	CVE
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc	CVE
https://security.gentoo.org/glsa/201607-15	CVE
https://security.netapp.com/advisory/ntap-20171004-0002/	CVE
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11	CVE
https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19	CVE
http://www.debian.org/security/2016/dsa-3629	CVE
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html	CVE
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html	CVE
http://www.securityfocus.com/bid/88276	CVE
http://www.securitytracker.com/id/1035705	CVE
http://www.talosintelligence.com/reports/TALOS-2016-0081/	CVE	MitigationTechnical DescriptionThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1552.html	[email protected]
https://access.redhat.com/errata/RHSA-2016:1141	[email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf	[email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf	[email protected]
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc	[email protected]
https://security.gentoo.org/glsa/201607-15	[email protected]
https://security.netapp.com/advisory/ntap-20171004-0002/	[email protected]
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11	[email protected]
https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19	[email protected]
http://www.debian.org/security/2016/dsa-3629	[email protected]
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html	[email protected]
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html	[email protected]
http://www.securityfocus.com/bid/88276	[email protected]
http://www.securitytracker.com/id/1035705	[email protected]
http://www.talosintelligence.com/reports/TALOS-2016-0081/	[email protected]	MitigationTechnical DescriptionThird Party Advisory

see all 30 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	[email protected]

Affected Products

Product	Versions
ntp ntp	<= 4.2.8
CPE cpe:2.3:a:ntp:ntp::p4::::::* Remediation No remediation found in references.

Change History

18 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
May 6, 2026	Status Change	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 17, 2021	CVE Modified	[email protected]
Nov 10, 2021	CVE Modified	[email protected]
Nov 5, 2021	CVE Modified	[email protected]
Jun 8, 2021	CVE Modified	[email protected]
Apr 16, 2021	CVE Modified	[email protected]
Apr 13, 2021	CVE Modified	[email protected]
Jan 5, 2018	CVE Modified	[email protected]
Nov 21, 2017	CVE Modified	[email protected]
Nov 10, 2017	CVE Modified	[email protected]
Nov 4, 2017	CVE Modified	[email protected]
Sep 3, 2017	CVE Modified	[email protected]
Jul 1, 2017	CVE Modified	[email protected]
Jan 11, 2017	CVE Modified	[email protected]
Jan 10, 2017	Initial Analysis	[email protected]