{"id":"USN-5008-1","summary":"avahi vulnerabilities","details":"Thomas Kremer discovered that Avahi incorrectly handled termination signals\non the Unix socket. A local attacker could possibly use this issue to cause\nAvahi to hang, resulting in a denial of service. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-3468)\n\nIt was discovered that Avahi incorrectly handled certain hostnames. A local\nattacker could possibly use this issue to cause Avahi to crash, resulting\nin a denial of service. This issue only affected Ubuntu 20.10 and Ubuntu\n21.04. (CVE-2021-3502)\n","modified":"2026-04-22T10:15:57.763033Z","published":"2021-07-07T17:19:33Z","related":["UBUNTU-CVE-2021-3468","UBUNTU-CVE-2021-3502"],"upstream":["CVE-2021-3468","CVE-2021-3502","UBUNTU-CVE-2021-3468","UBUNTU-CVE-2021-3502"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5008-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3468"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3502"}],"affected":[{"package":{"name":"avahi","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/avahi@0.7-3.1ubuntu1.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7-3.1ubuntu1.3"}]}],"versions":["0.6.32-1ubuntu1","0.7-3ubuntu1","0.7-3ubuntu2","0.7-3.1ubuntu1","0.7-3.1ubuntu1.1","0.7-3.1ubuntu1.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"avahi-daemon","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"avahi-discover","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"avahi-dnsconfd","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"avahi-ui-utils","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"avahi-utils","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"gir1.2-avahi-0.6","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-client3","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-common-data","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-common3","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-compat-libdnssd1","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-core7","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-glib1","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-gobject0","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.7-3.1ubuntu1.3"},{"binary_name":"python-avahi","binary_version":"0.7-3.1ubuntu1.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5008-1.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3468"}]}}},{"package":{"name":"avahi","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/avahi@0.7-4ubuntu7.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7-4ubuntu7.1"}]}],"versions":["0.7-4ubuntu5","0.7-4ubuntu6","0.7-4ubuntu7"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"avahi-daemon","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"avahi-discover","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"avahi-dnsconfd","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"avahi-ui-utils","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"avahi-utils","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"gir1.2-avahi-0.6","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-client3","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-common-data","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-common3","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-compat-libdnssd1","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-core7","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-glib1","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-gobject0","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.7-4ubuntu7.1"},{"binary_name":"python-avahi","binary_version":"0.7-4ubuntu7.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5008-1.json","cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3468"}]}}}],"schema_version":"1.7.5"}