{"id":"CVE-2018-8956","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-8956","generatedAt":"2026-10-29T01:53:46.183Z","title":"ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets.","description":"ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.","published":"2020-05-06T19:15:12.000Z","lastModified":"2026-06-17T02:05:43.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-20"],"affected":["ntp/ntp"],"epss":{"score":0.03144,"percentile":0.87854,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (3.14%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html","source":"cve@mitre.org"},{"url":"http://www.ntp.org/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://arxiv.org/abs/2005.01783","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://nikhiltripathi.in/NTP_attack.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20200518-0006/","source":"cve@mitre.org"},{"url":"https://tools.ietf.org/html/rfc5905","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ntp.org/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://arxiv.org/abs/2005.01783","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://nikhiltripathi.in/NTP_attack.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20200518-0006/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://tools.ietf.org/html/rfc5905","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-8956","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}