{"schemaVersion":3,"id":"CVE-2015-7851","aliases":["DEBIAN-CVE-2015-7851"],"status":"published","duplicateOf":null,"title":null,"description":"Directory traversal vulnerability in the save_config function in ntpd in ntp_control.c in NTP before 4.2.8p4, when used on systems that do not use '\\' or '/' characters for directory separation such as OpenVMS, allows remote authenticated users to overwrite arbitrary files.","dates":{"published":"2020-01-28T16:35:21.000Z","modified":"2024-08-06T07:59:00.648Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":3.5,"severity":"low","vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","exploitability":7.2,"impact":6,"computed":true}]},"epss":{"probability":0.03942,"percentile":0.9027,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.03942},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03942,"percentile":0.9027}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03942,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03942,"percentile":0.9027}]},"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":[{"id":"REF_23D1424B32CA9B47","name":"Exploit Reference (talosintel.com)","source":"reference","url":"http://www.talosintel.com/reports/TALOS-2015-0062/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"debian","product":"ntp","name":"ntp","label":"ntp","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/ntp","purlType":"deb","versions":[{"text":"< 1:4.2.8p4+dfsg-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:4.2.8p4+dfsg-1","eol":null,"hubHref":null},{"vendor":"ntp","product":"ntp","name":"ntp","label":"ntp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.2.0, < 4.2.8","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0, < 4.3.77","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-beta1","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-beta2","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-beta3","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-beta4","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-beta5","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p1-rc2","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p2","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p2-rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p2-rc2","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p2-rc3","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p3","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p3-rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p3-rc2","noFixRecorded":false,"fixedIn":null},{"text":"4.2.8:p3-rc3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.2.0, < 4.2.8 | ≥ 4.3.0, < 4.3.77 | 4.2.8:p1 | 4.2.8:p1-beta1 | 4.2.8:p1-beta2 | 4.2.8:p1-beta3 | 4.2.8:p1-beta4 | 4.2.8:p1-beta5 | 4.2.8:p1-rc1 | 4.2.8:p1-rc2 | 4.2.8:p2 | 4.2.8:p2-rc1 | 4.2.8:p2-rc2 | 4.2.8:p2-rc3 | 4.2.8:p3 | 4.2.8:p3-rc1 | 4.2.8:p3-rc2 | 4.2.8:p3-rc3","eol":null,"hubHref":"/vendor/ntp/ntp"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"http://www.talosintel.com/reports/TALOS-2015-0062/","label":"www.talosintel.com/reports/TALOS-2015-0062/","hostname":"www.talosintel.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"http://support.ntp.org/bin/view/Main/SecurityNotice","label":"support.ntp.org/bin/view/Main/SecurityNotice","hostname":"support.ntp.org","tags":["X Refsource MISC","Release Notes","Vendor Advisory"]},{"url":"http://support.ntp.org/bin/view/Main/NtpBug2918","label":"support.ntp.org/bin/view/Main/NtpBug2918","hostname":"support.ntp.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2015-7851","label":"security-tracker.debian.org/tracker/CVE-2015-7851","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-335-1","DSA-3388-1","OPENSUSE-SU-2024:10181-1","SUSE-SU-2015:2058-1","SUSE-SU-2016:1247-1","SUSE-SU-2016:1311-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:10181-1","SUSE-SU-2015:2058-1","SUSE-SU-2016:1247-1","SUSE-SU-2016:1311-1"]},"timeline":[{"kind":"published","date":"2020-01-28T16:35:21.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T07:59:00.648Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":37,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T10:06:17.158Z","stale":false,"partial":false}}