CVE-2017-14493: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 83.6% chance of exploitation in the next 30 days.

Stack-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DHCPv6 request.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.04 only
• Debian Debian Linux: version 7.0 only; version 7.1 only; version 9.0 only
• Opensuse Leap: version 42.2 only; version 42.3 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Thekelleys Dnsmasq: up to and including 2.77

Published 2017-10-03. Last modified 2026-06-17.