{"id":"UBUNTU-CVE-2016-7431","details":"NTP before 4.2.8p9 allows remote attackers to bypass the origin timestamp protection mechanism via an origin timestamp of zero.  NOTE: this vulnerability exists because of a CVE-2015-8138 regression.","modified":"2026-02-04T03:25:12.539907Z","published":"2017-01-13T00:00:00Z","withdrawn":"2025-07-18T16:43:37Z","related":["USN-3349-1"],"upstream":["CVE-2016-7431"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-7431"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3349-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-7431"}],"affected":[{"package":{"name":"ntp","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.10?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"}]}],"versions":["1:4.2.6.p5+dfsg-3ubuntu2","1:4.2.6.p5+dfsg-3ubuntu2.14.04.1","1:4.2.6.p5+dfsg-3ubuntu2.14.04.2","1:4.2.6.p5+dfsg-3ubuntu2.14.04.3","1:4.2.6.p5+dfsg-3ubuntu2.14.04.5","1:4.2.6.p5+dfsg-3ubuntu2.14.04.6","1:4.2.6.p5+dfsg-3ubuntu2.14.04.7","1:4.2.6.p5+dfsg-3ubuntu2.14.04.8"],"ecosystem_specific":{"binaries":[{"binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","binary_name":"ntp"},{"binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","binary_name":"ntp-dbgsym"},{"binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","binary_name":"ntp-doc"},{"binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","binary_name":"ntpdate"},{"binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","binary_name":"ntpdate-dbgsym"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-7431.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p4+dfsg-3ubuntu5.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.8p4+dfsg-3ubuntu5.3"}]}],"versions":["1:4.2.6.p5+dfsg-3ubuntu8","1:4.2.6.p5+dfsg-3ubuntu8.1","1:4.2.6.p5+dfsg-3ubuntu9","1:4.2.8p4+dfsg-3ubuntu1","1:4.2.8p4+dfsg-3ubuntu2","1:4.2.8p4+dfsg-3ubuntu3","1:4.2.8p4+dfsg-3ubuntu4","1:4.2.8p4+dfsg-3ubuntu5","1:4.2.8p4+dfsg-3ubuntu5.1","1:4.2.8p4+dfsg-3ubuntu5.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3","binary_name":"ntp"},{"binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3","binary_name":"ntp-dbgsym"},{"binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3","binary_name":"ntp-doc"},{"binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3","binary_name":"ntpdate"},{"binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3","binary_name":"ntpdate-dbgsym"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-7431.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}