{"cve":"CVE-2018-7170","nvd":{"published":"2018-03-06T20:29:01.297","modified":"2026-06-17T02:02:44.027","status":"Modified","description":"ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","score":5.3},"cwes":[],"references":["http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html","http://support.ntp.org/bin/view/Main/NtpBug3415","http://www.securityfocus.com/archive/1/541824/100/0/threaded","http://www.securityfocus.com/bid/103194","https://bugzilla.redhat.com/show_bug.cgi?id=1550214"],"products":["hpe:hpux-ntp","netapp:hci","netapp:solidfire","ntp:ntp","synology:diskstation_manager","synology:router_manager","synology:skynas","synology:virtual_diskstation_manager","synology:vs960hd_firmware"],"source":"nvd","synced_at":"2026-10-19T20:48:50.842038930+00:00"},"epss":{"cve":"CVE-2018-7170","score":0.02686,"percentile":0.85851,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}