CVE-2016-2774: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 73.6% chance of exploitation in the next 30 days.

ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 8.0 only
• ISC Dhcp: version 4.1-esv only; version 4.1.0 only; version 4.1.1 only; version 4.1.2 only; version 4.2.0 only; version 4.2.1 only; …

Published 2016-03-09. Last modified 2026-06-17.