{"id":"CVE-2015-7855","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-7855","generatedAt":"2026-11-05T04:39:43.654Z","title":"The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.","description":"The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.","published":"2017-08-07T20:29:01.000Z","lastModified":"2026-06-17T00:33:16.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-20"],"affected":["ntp/ntp","debian/debian linux","netapp/oncommand balance","netapp/oncommand performance manager","netapp/oncommand unified manager","netapp/clustered data ontap","netapp/data ontap","siemens/tim 4r-ie firmware","siemens/tim 4r-ie dnp3 firmware"],"epss":{"score":0.31068,"percentile":0.9827,"date":"2026-11-04","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2016-11-28","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40840,"kind":"exploit","title":"NTP 4.2.8p3 - Denial of Service","url":"https://www.exploit-db.com/exploits/40840","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/40840.py","file":"exploits/linux/dos/40840.py","published":"2016-11-28","added":"2016-11-28","updated":"2016-11-28","author":"Magnus Klaaborg Stubman","type":"dos","platform":"linux","port":null,"verified":true,"codes":["CVE-2015-7855"],"tags":null,"aliases":null,"applicationUrl":"http://www.exploit-db.comntp-4.2.8p3.tar.gz","screenshotUrl":"http://www.exploit-db.com/screenshots/idlt41000/screen-shot-2016-11-28-at-194133.png","referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 31.1%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://support.ntp.org/bin/view/Main/NtpBug2922","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2015/dsa-3388","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/77283","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1033951","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1274264","tags":["Issue Tracking","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201607-15","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20171004-0001/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11","tags":["Third Party Advisory","US Government Resource"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/40840/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://support.ntp.org/bin/view/Main/NtpBug2922","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2015/dsa-3388","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/77283","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1033951","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1274264","tags":["Issue Tracking","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201607-15","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20171004-0001/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40840/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-7855","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."}