CVE-2016-2517

MEDIUM

Ntp < 4.2.8 - Improper Input Validation

Title source: rule

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.

References (8)

[Vendor Advisory] http://support.ntp.org/bin/view/Main/NtpBug3010

[Third Party Advisory] http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/88189

[Third Party Advisory, VDB Entry] http://www.securitytracker.com/id/1035705

[Various Sources] https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc

[Third Party Advisory, US Government Resource] https://www.kb.cert.org/vuls/id/718152

[Vendor Advisory] https://security.netapp.com/advisory/ntap-20171004-0002/

[Third Party Advisory] https://security.gentoo.org/glsa/201607-15

Scores

CVSS v3 5.3

EPSS 0.0301

EPSS Percentile 86.4%

Attack Vector NETWORK

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

Classification

CWE

CWE-20

Status published

Affected Products (50)

ntp/ntp < 4.2.8

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

ntp/ntp

... and 35 more

Timeline

Published Jan 30, 2017

Tracked Since Feb 18, 2026