{"cve":"CVE-2016-1548","nvd":{"published":"2017-01-06T21:59:00.353","modified":"2026-06-17T00:42:08.687","status":"Modified","description":"An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","score":7.2},"cwes":["CWE-19"],"references":["http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html","http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html","http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html","http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html","http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html"],"products":["ntp:ntp"],"source":"nvd","synced_at":"2026-10-19T20:41:25.729257544+00:00"},"epss":{"cve":"CVE-2016-1548","score":0.03812,"percentile":0.90045,"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."]}