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.
| Reporter | Title | Published | Views | Family All 59 |
|---|---|---|---|---|
 | CVE-2021-26720 | 17 Feb 202122:15 | – | attackerkb |
 | CVE-2021-26720 | 17 Feb 202121:19 | – | alpinelinux |
 | Astra Linux – Vulnerability in avahi | 14 Sep 202612:01 | – | astralinux |
 | avahi-daemon-check-dns.sh Confidential Data Access DoS | 28 Sep 202200:00 | – | bdu_fstec |
 | CVE-2021-26720 affecting package avahi for versions less than 0.8-1 | 19 Mar 202417:21 | – | cbl_mariner |
| CVE-2021-26720 affecting package avahi for versions less than 0.8-1 | 26 Apr 202219:39 | – | cbl_mariner |
 | CVE-2021-26720 | 18 Feb 202100:49 | – | circl |
 | Debian avahi backlink vulnerability | 17 Feb 202100:00 | – | cnnvd |
 | CVE-2021-26720 | 17 Feb 202121:19 | – | cve |
 | CVE-2021-26720 | 17 Feb 202121:19 | – | cvelist |
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13 Aug 2026 06:05Current
8.6High risk
Vulners AI Score8.6
CVSS 24.6
CVSS 3.17.8
EPSS0.00395