What’s Vulnerable › Vulnerabilities

CVE-2018-7184

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-06 · updated 2026-06-17

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.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
• NetApp Cloud Backup: all versions
• NetApp Steelstore Cloud Integrated Storage: all versions
• NTP: 4.2.8-p10, 4.2.8-p4, 4.2.8-p5, 4.2.8-p6, 4.2.8-p7, 4.2.8-p8 (+1)
• Slackware Linux: 14.0, 14.1, 14.2
• Synology DiskStation Manager: 5.2, 6.0, 6.1
• Synology Router Manager (SRM): 1.1
• Synology Skynas: all versions
• Synology Virtual Diskstation Manager: all versions
• Synology Vs960Hd Firmware: all versions

References

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

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