UBUNTU-CVE-2021-26720
- Source
- https://ubuntu.com/security/CVE-2021-26720
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26720.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-26720
- Upstream
- Published
- 2021-02-17T22:15:00Z
- Modified
- 2025-07-18T16:46:41Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Ubuntu - low
- Summary
- [none]
- 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.
- References
Affected packages
Ubuntu:Pro:14.04:LTS / avahi
Package
- Name
- avahi
- Purl
- pkg:deb/ubuntu/avahi@0.6.31-4ubuntu1.3+esm3?arch=source&distro=esm-infra-legacy/trusty
Ubuntu:Pro:16.04:LTS / avahi
Package
- Name
- avahi
- Purl
- pkg:deb/ubuntu/avahi@0.6.32~rc+dfsg-1ubuntu2.3+esm3?arch=source&distro=esm-infra/xenial