{"id":"ALPINE-CVE-2021-26720","details":"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 arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.","modified":"2025-12-03T22:48:27.661016Z","published":"2021-02-17T22:15:12.710Z","upstream":["CVE-2021-26720"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-26720"}],"affected":[{"package":{"name":"avahi","ecosystem":"Alpine:v3.10","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}},{"package":{"name":"avahi","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/avahi?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-26720.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}