VULNERABILITY INTELLIGENCE

CVE-2021-26720

CVSS score7.8 HIGH

EPSS probability0.40%

CISA KEVNot currently listed

Published2021-02-17

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

nvd@nist.gov: CWE-59

Primary references

cve@mitre.org — Mailing List, Third Party Advisory
cve@mitre.org — Issue Tracking, Third Party Advisory
cve@mitre.org — Issue Tracking, Third Party Advisory
cve@mitre.org — Mailing List, Third Party Advisory
cve@mitre.org — Broken Link, Third Party Advisory
cve@mitre.org — Product, Third Party Advisory
cve@mitre.org — Product, Third Party Advisory
cve@mitre.org — Product, Third Party Advisory
cve@mitre.org — Third Party Advisory
cve@mitre.org — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Third Party Advisory