CVE-2016-7426

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.

• CWE-400

• http://nwtime.org/ntp428p9_release/Third Party Advisory
• http://rhn.redhat.com/errata/RHSA-2017-0252.htmlThird Party Advisory
• http://support.ntp.org/bin/view/Main/NtpBug3071Issue Tracking, Mitigation, Vendor Advisory
• http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
• http://www.securityfocus.com/bid/94451Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
• https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
• https://usn.ubuntu.com/3707-2/Third Party Advisory
• https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource
• http://nwtime.org/ntp428p9_release/Third Party Advisory
• http://rhn.redhat.com/errata/RHSA-2017-0252.htmlThird Party Advisory
• http://support.ntp.org/bin/view/Main/NtpBug3071Issue Tracking, Mitigation, Vendor Advisory
• http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
• http://www.securityfocus.com/bid/94451Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
• https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
• https://usn.ubuntu.com/3707-2/Third Party Advisory
• https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource

Published

Jan 13, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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