CVE-2021-3502

5.5 mediumEPSS 0.4%

Medium (5.5) in avahi avahi. EPSS 0.4% chance of exploitation in the next 30 days.

A flaw was found in avahi 0.8-5. 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.

Severity

CVSS 3.1

5.5 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
CWE: CWE-617
Published: 2021-05-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

avahi:avahi

References

https://bugzilla.redhat.com/show_bug.cgi?id=1946914
https://github.com/lathiat/avahi/issues/338
https://bugzilla.redhat.com/show_bug.cgi?id=1946914
https://github.com/lathiat/avahi/issues/338

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