{"id":"CVE-2015-8138","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-8138","generatedAt":"2026-10-27T19:51:32.156Z","title":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","published":"2017-01-30T21:59:01.000Z","lastModified":"2026-06-17T00:34:05.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-20"],"affected":["ntp/ntp"],"epss":{"score":0.06255,"percentile":0.93514,"date":"2026-10-26","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 (6.25%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html","tags":["Third Party 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Advisory"],"source":"cve@mitre.org"},{"url":"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2016/dsa-3629","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/81811","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1034782","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.ubuntu.com/usn/USN-3096-1","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bto.bluecoat.com/security-advisory/sa113","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf","source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf","source":"cve@mitre.org"},{"url":"https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us","source":"cve@mitre.org"},{"url":"https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us","source":"cve@mitre.org"},{"url":"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc","source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201607-15","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20171004-0002/","source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20171031-0001/","source":"cve@mitre.org"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161123-ntpd","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11","source":"cve@mitre.org"},{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19","source":"cve@mitre.org"},{"url":"https://www.kb.cert.org/vuls/id/718152","tags":["Third Party Advisory","US Government Resource"],"source":"cve@mitre.org"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html","tags":["Third Party 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Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201607-15","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20171004-0002/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20171031-0001/","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-8138","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."}