{"id":"UBUNTU-CVE-2020-11868","details":"ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.","modified":"2025-10-24T04:48:26Z","published":"2020-04-17T04:15:00Z","upstream":["CVE-2020-11868"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-11868"},{"type":"REPORT","url":"http://support.ntp.org/bin/view/Main/NtpBug3592"},{"type":"REPORT","url":"http://bugs.ntp.org/3592"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1716665"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-11868"},{"type":"REPORT","url":"https://gitlab.com/NTPsec/ntpsec/-/issues/651"}],"affected":[{"package":{"name":"ntp","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","1:4.2.6.p5+dfsg-3ubuntu2.14.04.11","1:4.2.6.p5+dfsg-3ubuntu2.14.04.12","1:4.2.6.p5+dfsg-3ubuntu2.14.04.13","1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"},{"binary_name":"ntpdate","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11868.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p4+dfsg-3ubuntu5.10?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1:4.2.8p4+dfsg-3ubuntu5.3","1:4.2.8p4+dfsg-3ubuntu5.4","1:4.2.8p4+dfsg-3ubuntu5.5","1:4.2.8p4+dfsg-3ubuntu5.6","1:4.2.8p4+dfsg-3ubuntu5.7","1:4.2.8p4+dfsg-3ubuntu5.8","1:4.2.8p4+dfsg-3ubuntu5.9","1:4.2.8p4+dfsg-3ubuntu5.10"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.10"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11868.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p10+dfsg-5ubuntu7.3+esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.8p10+dfsg-5ubuntu3","1:4.2.8p10+dfsg-5ubuntu4","1:4.2.8p10+dfsg-5ubuntu5","1:4.2.8p10+dfsg-5ubuntu6","1:4.2.8p10+dfsg-5ubuntu7","1:4.2.8p10+dfsg-5ubuntu7.1","1:4.2.8p10+dfsg-5ubuntu7.1+esm1","1:4.2.8p10+dfsg-5ubuntu7.1+esm2","1:4.2.8p10+dfsg-5ubuntu7.2","1:4.2.8p10+dfsg-5ubuntu7.2+esm1","1:4.2.8p10+dfsg-5ubuntu7.3","1:4.2.8p10+dfsg-5ubuntu7.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"},{"binary_name":"sntp","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11868.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.8p12+dfsg-3ubuntu2","1:4.2.8p12+dfsg-3ubuntu3","1:4.2.8p12+dfsg-3ubuntu4","1:4.2.8p12+dfsg-3ubuntu4.20.04.1","1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1"},{"binary_name":"sntp","binary_version":"1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11868.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p15+dfsg-1ubuntu2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.8p12+dfsg-3ubuntu6","1:4.2.8p15+dfsg-1ubuntu1","1:4.2.8p15+dfsg-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:4.2.8p15+dfsg-1ubuntu2","binary_name":"ntp"},{"binary_version":"1:4.2.8p15+dfsg-1ubuntu2","binary_name":"ntpdate"},{"binary_name":"sntp","binary_version":"1:4.2.8p15+dfsg-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/u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