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Vulnerability record · CVE-2018-7184 · published 6 March 2018

CVE-2018-7184: Ntp vulnerability

Ntp · Ntp

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

7.5 CVSS 3.0 High EPSS 8.5% · top 5.1%
7.5CVSS 3.0 base score, v2 5.0
8.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html Third Party AdvisoryVDB Entry
http://support.ntp.org/bin/view/Main/NtpBug3453 Third Party Advisory
http://www.securityfocus.com/archive/1/541824/100/0/threaded Third Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/103192 Third Party AdvisoryVDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc Third Party Advisory
https://security.gentoo.org/glsa/201805-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20180626-0001/ Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
https://usn.ubuntu.com/3707-1/ Third Party Advisory
https://www.synology.com/support/security/Synology_SA_18_13 Third Party Advisory
http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html Third Party AdvisoryVDB Entry
http://support.ntp.org/bin/view/Main/NtpBug3453 Third Party Advisory
http://www.securityfocus.com/archive/1/541824/100/0/threaded Third Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/103192 Third Party AdvisoryVDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc Third Party Advisory
https://security.gentoo.org/glsa/201805-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20180626-0001/ Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
https://usn.ubuntu.com/3707-1/ Third Party Advisory
https://www.synology.com/support/security/Synology_SA_18_13 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-7184), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.