CVE-2025-68471

avahi: Avahi: Denial of Service via unsolicited CNAME announcements

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · January 13, 2026

Updated · September 1, 2026

Description

A flaw was found in Avahi, a system that enables devices to discover services on a local network using the mDNS/DNS-SD (Multicast Domain Name System/DNS-based Service Discovery) protocols. A remote attacker can exploit this by sending two specific network messages, known as unsolicited announcements with CNAME resource records, within a two-second timeframe. This action can cause the avahi-daemon process to crash, leading to a Denial of Service (DoS) for the affected system.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE-617 · Reachable Assertion