{"action":"Upgrade avahi to 0.8-4 or later.","affected":[{"fixed":"0.8-4","introduced":"0"}],"component":"avahi","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["0.8-4"],"id":"tcs_01M5NFGBCH6P0VXB4H79YHQM2S","modified_at":"2026-10-23T18:02:52.098508322Z","published_at":"2021-02-17T22:15:12.710Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-26720","https://security-tracker.debian.org/tracker/CVE-2021-26720"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-26720#Debian:14/avahi","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-26720"}],"summary":"avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitr"}