CVE-2009-0758: Avahi Avahi-Daemon

High severity, CVSS 7.8. EPSS: 2% chance of exploitation in the next 30 days.

The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte order of a port number when processing incoming multicast packets, which allows remote attackers to cause a denial of service (network bandwidth and CPU consumption) via a crafted legacy unicast mDNS query packet that triggers a multicast packet storm.

Affected products

• Avahi Avahi-Daemon: version 0.6.23 only

Published 2009-03-03. Last modified 2026-06-16.