CVE-2018-7184: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 8.5% chance of exploitation in the next 30 days.

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: version 14.04 only; version 16.04 only; version 17.10 only; version 18.04 only
• Netapp Cloud Backup: affected versions not specified
• Netapp Steelstore Cloud Integrated Storage: affected versions not specified
• Ntp Ntp: version 4.2.8 only
• Slackware Slackware Linux: version 14.0 only; version 14.1 only; version 14.2 only
• Synology Diskstation Manager: version 5.2 only; version 6.0 only; version 6.1 only
• Synology Router Manager: version 1.1 only
• Synology Skynas: affected versions not specified
• Synology Virtual Diskstation Manager: affected versions not specified
• Synology VS960HD Firmware: affected versions not specified

Published 2018-03-06. Last modified 2026-06-17.