{"schemaVersion":3,"id":"USN-3096-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"ntp vulnerabilities\n\nAanchal Malhotra discovered that NTP incorrectly handled authenticated\nbroadcast mode. A remote attacker could use this issue to perform a replay\nattack. (CVE-2015-7973)\n\nMatt Street discovered that NTP incorrectly verified peer associations of\nsymmetric keys. A remote attacker could use this issue to perform an\nimpersonation attack. (CVE-2015-7974)\n\nJonathan Gardner discovered that the NTP ntpq utility incorrectly handled\nmemory. An attacker could possibly use this issue to cause ntpq to crash,\nresulting in a denial of service. This issue only affected Ubuntu 16.04\nLTS. (CVE-2015-7975)\n\nJonathan Gardner discovered that the NTP ntpq utility incorrectly handled\ndangerous characters in filenames. An attacker could possibly use this\nissue to overwrite arbitrary files. (CVE-2015-7976)\n\nStephen Gray discovered that NTP incorrectly handled large restrict lists.\nAn attacker could use this issue to cause NTP to crash, resulting in a\ndenial of service. (CVE-2015-7977, CVE-2015-7978)\n\nAanchal Malhotra discovered that NTP incorrectly handled authenticated\nbroadcast mode. A remote attacker could use this issue to cause NTP to\ncrash, resulting in a denial of service. (CVE-2015-7979)\n\nJonathan Gardner discovered that NTP incorrectly handled origin timestamp\nchecks. A remote attacker could use this issue to spoof peer servers.\n(CVE-2015-8138)\n\nJonathan Gardner discovered that the NTP ntpq utility did not properly\nhandle certain incorrect values. An attacker could possibly use this issue\nto cause ntpq to hang, resulting in a denial of service. (CVE-2015-8158)\n\nIt was discovered that the NTP cronjob incorrectly cleaned up the\nstatistics directory. A local attacker could possibly use this to escalate\nprivileges. (CVE-2016-0727)\n\nStephen Gray and Matthew Van Gundy discovered that NTP incorrectly\nvalidated crypto-NAKs. A remote attacker could possibly use this issue to\nprevent clients from synchronizing. (CVE-2016-1547)\n\nMiroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly\nhandled switching to interleaved symmetric mode. A remote attacker could\npossibly use this issue to prevent clients from synchronizing.\n(CVE-2016-1548)\n\nMatthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that\nNTP incorrectly handled message authentication. A remote attacker could\npossibly use this issue to recover the message digest key. (CVE-2016-1550)\n\nYihan Lian discovered that NTP incorrectly handled duplicate IPs on\nunconfig directives. An authenticated remote attacker could possibly use\nthis issue to cause NTP to crash, resulting in a denial of service.\n(CVE-2016-2516)\n\nYihan Lian discovered that NTP incorrectly handled certail peer\nassociations. A remote attacker could possibly use this issue to cause NTP\nto crash, resulting in a denial of service. (CVE-2016-2518)\n\nJakub Prokes discovered that NTP incorrectly handled certain spoofed\npackets. A remote attacker could possibly use this issue to cause a denial\nof service. (CVE-2016-4954)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain packets\nwhen autokey is enabled. A remote attacker could possibly use this issue to\ncause a denial of service. (CVE-2016-4955)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain spoofed\nbroadcast packets. A remote attacker could possibly use this issue to\ncause a denial of service. (CVE-2016-4956)\n\nIn the default installation, attackers would be isolated by the NTP\nAppArmor profile.","dates":{"published":"2016-10-05T18:01:12.000Z","modified":"2026-02-10T04:41:02.000Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":[],"affected":[{"vendor":"ubuntu","product":"ntp","name":"ntp","label":"ntp","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/ntp","purlType":"deb","versions":[{"text":"< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","noFixRecorded":false,"fixedIn":null},{"text":"< 1:4.2.8p4+dfsg-3ubuntu5.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 | < 1:4.2.8p4+dfsg-3ubuntu5.3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-3096-1","label":"ubuntu.com/security/notices/USN-3096-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2015-7973","label":"ubuntu.com/security/CVE-2015-7973","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7974","label":"ubuntu.com/security/CVE-2015-7974","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7975","label":"ubuntu.com/security/CVE-2015-7975","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7976","label":"ubuntu.com/security/CVE-2015-7976","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7977","label":"ubuntu.com/security/CVE-2015-7977","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7978","label":"ubuntu.com/security/CVE-2015-7978","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-7979","label":"ubuntu.com/security/CVE-2015-7979","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-8138","label":"ubuntu.com/security/CVE-2015-8138","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2015-8158","label":"ubuntu.com/security/CVE-2015-8158","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-0727","label":"ubuntu.com/security/CVE-2016-0727","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-1547","label":"ubuntu.com/security/CVE-2016-1547","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-1548","label":"ubuntu.com/security/CVE-2016-1548","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-1550","label":"ubuntu.com/security/CVE-2016-1550","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-2516","label":"ubuntu.com/security/CVE-2016-2516","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-2518","label":"ubuntu.com/security/CVE-2016-2518","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-4954","label":"ubuntu.com/security/CVE-2016-4954","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-4955","label":"ubuntu.com/security/CVE-2016-4955","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-4956","label":"ubuntu.com/security/CVE-2016-4956","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2015-7973","CVE-2015-7974","CVE-2015-7975","CVE-2015-7976","CVE-2015-7977","CVE-2015-7978","CVE-2015-7979","CVE-2015-8138","CVE-2015-8158","CVE-2016-0727","CVE-2016-1547","CVE-2016-1548","CVE-2016-1550","CVE-2016-2516","CVE-2016-2518","CVE-2016-4954","CVE-2016-4955","CVE-2016-4956"],"downstream":[],"duplicates":[],"related":["CVE-2015-7973","CVE-2015-7974","CVE-2015-7975","CVE-2015-7976","CVE-2015-7977","CVE-2015-7978","CVE-2015-7979","CVE-2015-8138","CVE-2015-8158","CVE-2016-0727","CVE-2016-1547","CVE-2016-1548","CVE-2016-1550","CVE-2016-2516","CVE-2016-2518","CVE-2016-4954","CVE-2016-4955","CVE-2016-4956"]},"timeline":[{"kind":"published","date":"2016-10-05T18:01:12.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-10T04:41:02.000Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T07:14:53.981Z","stale":false,"partial":false}}