CVE-2021-26720
HIGH7.8EPSS 0.09%avahi - security update
Published: 2/17/2021Modified: 12/3/2025
Also known as:ALPINE-CVE-2021-26720
Description
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.
Affected packages (3)
- Alpine/avahifrom 0, < 0
- Debian/avahifrom 0, < 0.8-4
- Debian/avahifrom 0, < 0.6.32-2+deb9u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |