CVE-2017-6519: Avahi

Critical severity, CVSS 9.1. EPSS: 3.2% chance of exploitation in the next 30 days.

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.

Affected products

• Avahi Avahi: up to and including 0.6.32; version 0.7 only
• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only

Published 2017-05-01. Last modified 2026-06-17.