{"schemaVersion":3,"id":"USN-3349-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"ntp vulnerabilities\n\nYihan Lian discovered that NTP incorrectly handled certain large request\ndata values. A remote attacker could possibly use this issue to cause NTP\nto crash, resulting in a denial of service. This issue only affected\nUbuntu 16.04 LTS. (CVE-2016-2519)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain spoofed\naddresses when performing rate limiting. A remote attacker could possibly\nuse this issue to perform a denial of service. This issue only affected\nUbuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7426)\n\nMatthew Van Gundy discovered that NTP incorrectly handled certain crafted\nbroadcast mode packets. A remote attacker could possibly use this issue to\nperform a denial of service. This issue only affected Ubuntu 14.04 LTS,\nUbuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7427, CVE-2016-7428)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain responses.\nA remote attacker could possibly use this issue to perform a denial of\nservice. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and\nUbuntu 16.10. (CVE-2016-7429)\n\nSharon Goldberg and Aanchal Malhotra discovered that NTP incorrectly\nhandled origin timestamps of zero. A remote attacker could possibly use\nthis issue to bypass the origin timestamp protection mechanism. This issue\nonly affected Ubuntu 16.10. (CVE-2016-7431)\n\nBrian Utterback, Sharon Goldberg and Aanchal Malhotra discovered that NTP\nincorrectly performed initial sync calculations. This issue only applied\nto Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7433)\n\nMagnus Stubman discovered that NTP incorrectly handled certain mrulist\nqueries. A remote attacker could possibly use this issue to cause NTP to\ncrash, resulting in a denial of service. This issue only affected Ubuntu\n16.04 LTS and Ubuntu 16.10. (CVE-2016-7434)\n\nMatthew Van Gund discovered that NTP incorrectly handled origin timestamp\nchecks. A remote attacker could possibly use this issue to perform a denial\nof service. This issue only affected Ubuntu Ubuntu 16.10, and Ubuntu 17.04.\n(CVE-2016-9042)\n\nMatthew Van Gundy discovered that NTP incorrectly handled certain control\nmode packets. A remote attacker could use this issue to set or unset traps.\nThis issue only applied to Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu\n16.10. (CVE-2016-9310)\n\nMatthew Van Gundy discovered that NTP incorrectly handled the trap service.\nA remote attacker could possibly use this issue to cause NTP to crash,\nresulting in a denial of service. This issue only applied to Ubuntu 14.04\nLTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-9311)\n\nIt was discovered that NTP incorrectly handled memory when processing long\nvariables. A remote authenticated user could possibly use this issue to\ncause NTP to crash, resulting in a denial of service. (CVE-2017-6458)\n\nIt was discovered that NTP incorrectly handled memory when processing long\nvariables. A remote authenticated user could possibly use this issue to\ncause NTP to crash, resulting in a denial of service. This issue only\napplied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-6460)\n\nIt was discovered that the NTP legacy DPTS refclock driver incorrectly\nhandled the /dev/datum device. A local attacker could possibly use this\nissue to cause a denial of service. (CVE-2017-6462)\n\nIt was discovered that NTP incorrectly handled certain invalid settings\nin a :config directive. A remote authenticated user could possibly use\nthis issue to cause NTP to crash, resulting in a denial of service.\n(CVE-2017-6463)\n\nIt was discovered that NTP incorrectly handled certain invalid mode\nconfiguration directives. A remote authenticated user could possibly use\nthis issue to cause NTP to crash, resulting in a denial of service.\n(CVE-2017-6464)","dates":{"published":"2017-07-05T18:19:15.000Z","modified":"2026-02-10T04:41:09.000Z","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-3ubuntu2.14.04.11","noFixRecorded":false,"fixedIn":null},{"text":"< 1:4.2.8p4+dfsg-3ubuntu5.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.11 | < 1:4.2.8p4+dfsg-3ubuntu5.5","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-3349-1","label":"ubuntu.com/security/notices/USN-3349-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-2519","label":"ubuntu.com/security/CVE-2016-2519","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7426","label":"ubuntu.com/security/CVE-2016-7426","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7427","label":"ubuntu.com/security/CVE-2016-7427","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7428","label":"ubuntu.com/security/CVE-2016-7428","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7429","label":"ubuntu.com/security/CVE-2016-7429","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7431","label":"ubuntu.com/security/CVE-2016-7431","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7433","label":"ubuntu.com/security/CVE-2016-7433","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-7434","label":"ubuntu.com/security/CVE-2016-7434","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-9042","label":"ubuntu.com/security/CVE-2016-9042","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-9310","label":"ubuntu.com/security/CVE-2016-9310","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2016-9311","label":"ubuntu.com/security/CVE-2016-9311","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-6458","label":"ubuntu.com/security/CVE-2017-6458","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-6460","label":"ubuntu.com/security/CVE-2017-6460","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-6462","label":"ubuntu.com/security/CVE-2017-6462","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-6463","label":"ubuntu.com/security/CVE-2017-6463","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2017-6464","label":"ubuntu.com/security/CVE-2017-6464","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2016-2519","CVE-2016-7426","CVE-2016-7427","CVE-2016-7428","CVE-2016-7429","CVE-2016-7431","CVE-2016-7433","CVE-2016-7434","CVE-2016-9042","CVE-2016-9310","CVE-2016-9311","CVE-2017-6458","CVE-2017-6460","CVE-2017-6462","CVE-2017-6463","CVE-2017-6464"],"downstream":[],"duplicates":[],"related":["CVE-2016-2519","CVE-2016-7426","CVE-2016-7427","CVE-2016-7428","CVE-2016-7429","CVE-2016-7431","CVE-2016-7433","CVE-2016-7434","CVE-2016-9042","CVE-2016-9310","CVE-2016-9311","CVE-2017-6458","CVE-2017-6460","CVE-2017-6462","CVE-2017-6463","CVE-2017-6464"]},"timeline":[{"kind":"published","date":"2017-07-05T18:19:15.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-10T04:41:09.000Z","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":"2026-10-19T08:20:13.197Z","stale":false,"partial":false}}