CVE-2021-3502

avahi: reachable assertion in avahi_s_host_name_resolver_start when trying to resolve badly-formatted hostnames

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · March 29, 2021

Updated · June 27, 2026

Description

A flaw was found in avahi. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.

Statement

This issue did not affect the versions of avahi as shipped with Red Hat Enterprise Linux 6, 7, and 8 as they did not include the vulnerable code.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-617 · Reachable Assertion