Reachable assertion in Avahi - CVE-2025-68471
Published: April 24, 2026
Vulnerability identifier: #VU127433
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-68471
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: avahi.org
Affected software:
Avahi
Avahi
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to reachable assertion in lookup_start when processing unsolicited multicast DNS announcements with CNAME resource records. A remote attacker can send two specially crafted unsolicited announcements to cause a denial of service.
The issue affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, and user interaction is required.
How to mitigate CVE-2025-68471
Install security update from vendor's website.