{"schemaVersion":3,"id":"CVE-2016-4957","aliases":["DEBIAN-CVE-2016-4957"],"status":"published","duplicateOf":null,"title":null,"description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","dates":{"published":"2016-07-05T01:00:00.000Z","modified":"2024-08-06T00:46:40.165Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":0.44936,"percentile":0.98766,"severity":"high","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.44936},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.44936,"percentile":0.98766}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.44936,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.44936,"percentile":0.98766}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"debian","product":"ntp","name":"ntp","label":"ntp","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/ntp","purlType":"deb","versions":[{"text":"< 1:4.2.8p8+dfsg-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:4.2.8p8+dfsg-1","eol":null,"hubHref":null},{"vendor":"novell","product":"suse_manager","name":"suse manager","label":"suse_manager","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"2.1","eol":null,"hubHref":"/vendor/novell/suse_manager"},{"vendor":"ntp","product":"ntp","name":"ntp","label":"ntp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.2.8:p7","noFixRecorded":false,"fixedIn":null},{"text":"4.3.92","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.2.8:p7 | 4.3.92","eol":null,"hubHref":"/vendor/ntp/ntp"},{"vendor":"opensuse","product":"leap","name":"leap","label":"leap","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"42.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"42.1","eol":{"isEol":true,"eolDate":"2017-05-17T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"42.1","label":"Leap 42.1","eolFrom":"2017-05-17T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"opensuse","label":"openSUSE","category":"os"}},"hubHref":"/vendor/opensuse/leap"},{"vendor":"opensuse","product":"opensuse","name":"opensuse","label":"opensuse","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"13.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"13.2","eol":{"isEol":true,"eolDate":"2017-01-17T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"13.2","label":"13.2","eolFrom":"2017-01-17T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"opensuse","label":"openSUSE","category":"os"}},"hubHref":"/vendor/opensuse/opensuse"},{"vendor":"oracle","product":"solaris","name":"Solaris","label":"solaris","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"10","noFixRecorded":false,"fixedIn":null},{"text":"11.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"10 | 11.3","eol":{"isEol":true,"eolDate":"2018-01-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"10","label":"10","eolFrom":"2018-01-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":null},"product":{"name":"oracle-solaris","label":"Oracle Solaris","category":"os"}},"hubHref":"/vendor/oracle/solaris"},{"vendor":"suse","product":"linux_enterprise_desktop","name":"linux enterprise desktop","label":"linux_enterprise_desktop","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"12:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"12:sp1","eol":null,"hubHref":"/vendor/suse/linux_enterprise_desktop"},{"vendor":"suse","product":"linux_enterprise_server","name":"linux enterprise server","label":"linux_enterprise_server","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"11:sp2","noFixRecorded":false,"fixedIn":null},{"text":"11:sp3","noFixRecorded":false,"fixedIn":null},{"text":"11:sp4","noFixRecorded":false,"fixedIn":null},{"text":"12:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"11:sp2 | 11:sp3 | 11:sp4 | 12:sp1","eol":null,"hubHref":"/vendor/suse/linux_enterprise_server"},{"vendor":"suse","product":"manager_proxy","name":"manager proxy","label":"manager_proxy","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"2.1","eol":null,"hubHref":"/vendor/suse/manager_proxy"},{"vendor":"suse","product":"openstack_cloud","name":"openstack cloud","label":"openstack_cloud","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"5","noFixRecorded":false,"fixedIn":null}],"versionsText":"5","eol":null,"hubHref":"/vendor/suse/openstack_cloud"}],"affectedCount":10,"eol":{"hasEol":true,"count":3},"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html","label":"lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html","label":"lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc","label":"security.freebsd.org/advisories/FreeBSD-SA-16:24.ntp.asc","hostname":"security.freebsd.org","tags":["Vendor Advisory","X Refsource FREEBSD","Third Party Advisory"]},{"url":"http://bugs.ntp.org/3046","label":"bugs.ntp.org/3046","hostname":"bugs.ntp.org","tags":["X Refsource CONFIRM","Issue Tracking","Vendor Advisory"]},{"url":"http://www.securitytracker.com/id/1036037","label":"www.securitytracker.com/id/1036037","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html","label":"lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html","label":"www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html","hostname":"www.oracle.com","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"http://www.kb.cert.org/vuls/id/321640","label":"www.kb.cert.org/vuls/id/321640","hostname":"www.kb.cert.org","tags":["Third Party Advisory","X Refsource CERT VN","US Government Resource"]},{"url":"http://support.ntp.org/bin/view/Main/SecurityNotice","label":"support.ntp.org/bin/view/Main/SecurityNotice","hostname":"support.ntp.org","tags":["X Refsource CONFIRM","Release Notes","Vendor Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html","label":"lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://support.ntp.org/bin/view/Main/NtpBug3046","label":"support.ntp.org/bin/view/Main/NtpBug3046","hostname":"support.ntp.org","tags":["X Refsource CONFIRM","Patch","Vendor Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html","label":"lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/201607-15","label":"security.gentoo.org/glsa/201607-15","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-4957","label":"security-tracker.debian.org/tracker/CVE-2016-4957","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2024:10181-1","SUSE-SU-2016:1563-1","SUSE-SU-2016:1568-1","SUSE-SU-2016:1584-1","SUSE-SU-2016:1602-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:10181-1","SUSE-SU-2016:1563-1","SUSE-SU-2016:1568-1","SUSE-SU-2016:1584-1","SUSE-SU-2016:1602-1"]},"timeline":[{"kind":"published","date":"2016-07-05T01:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T00:46:40.165Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":39,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T18:45:23.747Z","stale":false,"partial":false}}