CVE-2016-2517

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.

Metrics

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://support.ntp.org/bin/view/Main/NtpBug3010Vendor Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securityfocus.com/bid/88189Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035705
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
https://security.gentoo.org/glsa/201607-15
https://security.netapp.com/advisory/ntap-20171004-0002/
https://www.kb.cert.org/vuls/id/718152Third Party Advisory, US Government Resource
http://support.ntp.org/bin/view/Main/NtpBug3010Vendor Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securityfocus.com/bid/88189Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035705
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
https://security.gentoo.org/glsa/201607-15
https://security.netapp.com/advisory/ntap-20171004-0002/
https://www.kb.cert.org/vuls/id/718152Third Party Advisory, US Government Resource

Timeline

Published: Jan 30, 2017
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2016

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