CVE-2021-3502

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-07 · updated 2026-06-17
Weakness: CWE-617

Description

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.

Affected products

avahi: 0.8-5

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

Get alerted when CVE-2021-3502 or the next vulnerability affects your stack