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Vulnerability · Published Jun 2, 2021 · Assigned by redhat

CVE-2021-3468

Medium 5.5

In plain English

A medium-severity infinite loop in avahi. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 61.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8avahi0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-autoipd0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8avahi-compat-howl0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-compat-howl0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-compat-howl-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-compat-howl-devel0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-compat-libdns_sd0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-compat-libdns_sd0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-compat-libdns_sd-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-compat-libdns_sd-devel0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-devel0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-glib0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-glib0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-glib-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-glib-devel0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-gobject0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8avahi-gobject-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8avahi-libs0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-libs0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-tools0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:9avahi-tools0.8-15.el9ALSA-2023:6707
AlmaLinux:8avahi-ui0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8avahi-ui-devel0.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8avahi-ui-gtk30.7-21.el8_9.1ALSA-2023:7836
AlmaLinux:8python3-avahi0.7-21.el8_9.1ALSA-2023:7836
Alpine:v3.20avahi0.8-r4ALPINE-CVE-2021-3468
Alpine:v3.21avahi0.8-r4ALPINE-CVE-2021-3468
Alpine:v3.22avahi0.8-r4ALPINE-CVE-2021-3468
Alpine:v3.23avahi0.8-r4ALPINE-CVE-2021-3468
Alpine:v3.24avahi0.8-r4ALPINE-CVE-2021-3468
Debian:12avahi0.8-7DEBIAN-CVE-2021-3468
Debian:13avahi0.8-7DEBIAN-CVE-2021-3468
Debian:14avahi0.8-7DEBIAN-CVE-2021-3468
Rocky Linux:8avahi0:0.7-21.el8_9.1RLSA-2023:7836

Affected products (as reported)

VendorProductVersions
n/a avahi All avahi versions 0.6 up to 0.8

Weakness: CWE-835

References