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Vulnerability record · CVE-2016-7426 · published 13 January 2017

CVE-2016-7426: Ntp uncontrolled resource consumption vulnerability

Ntp · Ntp

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

7.5 CVSS 3.1 High EPSS 12% · top 3.9% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 4.3
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://nwtime.org/ntp428p9_release/ Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0252.html Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3071 Issue TrackingMitigationVendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities Release NotesVendor Advisory
http://www.securityfocus.com/bid/94451 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037354 Third Party AdvisoryVDB Entry
https://bto.bluecoat.com/security-advisory/sa139 Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc Third Party Advisory
https://usn.ubuntu.com/3707-2/ Third Party Advisory
https://www.kb.cert.org/vuls/id/633847 Third Party AdvisoryUS Government Resource
http://nwtime.org/ntp428p9_release/ Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0252.html Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3071 Issue TrackingMitigationVendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities Release NotesVendor Advisory
http://www.securityfocus.com/bid/94451 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037354 Third Party AdvisoryVDB Entry
https://bto.bluecoat.com/security-advisory/sa139 Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc Third Party Advisory
https://usn.ubuntu.com/3707-2/ Third Party Advisory
https://www.kb.cert.org/vuls/id/633847 Third Party AdvisoryUS Government Resource

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Source: NIST National Vulnerability Database (record CVE-2016-7426), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.