CVE catalog
CVE-2021-26720
avahi: CVE-2021-26720
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.40% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | avahi | sid | 0.8-18 | fixed |
| Debian | avahi | forky | 0.8-18 | fixed |
| Debian | avahi | trixie | 0.8-16 | fixed |
| Debian | avahi | bookworm | 0.8-10+deb12u1 | fixed |
| Ubuntu | avahi | pro | 0.6.32-1ubuntu1 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3ubuntu1 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3ubuntu2 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.1 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.2 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.3 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.3+esm1 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.3+esm2 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.3+esm3 | vulnerable |
| Ubuntu | avahi | pro | 0.7-3.1ubuntu1.3+esm4 | vulnerable |
| Suse | avahi | linux enterprise module for basesystem 15 sp2 | 0.7-3.6.1 | fixed |
| Suse | avahi-glib2 | linux enterprise module for basesystem 15 sp2 | 0.7-3.6.1 | fixed |
| Suse | avahi | linux enterprise module for desktop applications 15 sp2 | 0.7-3.6.1 | fixed |
| Suse | avahi-glib2 | linux enterprise module for desktop applications 15 sp2 | 0.7-3.6.1 | fixed |
| Suse | avahi | linux enterprise module for package hub 15 sp2 | 0.7-3.6.1 | fixed |
| Suse | avahi | linux enterprise high performance computing 15-espos | 0.6.32-5.13.1 | fixed |
| Suse | avahi-glib2 | linux enterprise high performance computing 15-espos | 0.6.32-5.13.1 | fixed |
| Suse | avahi | linux enterprise high performance computing 15-ltss | 0.6.32-5.13.1 | fixed |
| Suse | avahi-glib2 | linux enterprise high performance computing 15-ltss | 0.6.32-5.13.1 | fixed |
| Suse | avahi | linux enterprise server 15-ltss | 0.6.32-5.13.1 | fixed |
| Suse | avahi-glib2 | linux enterprise server 15-ltss | 0.6.32-5.13.1 | fixed |
| Suse | avahi | linux enterprise server for sap applications 15 | 0.6.32-5.13.1 | fixed |
| Suse | avahi-glib2 | linux enterprise server for sap applications 15 | 0.6.32-5.13.1 | fixed |
| Suse | avahi | linux enterprise software development kit 12 sp5 | 0.6.32-32.12.2 | fixed |
| Suse | avahi-glib2 | linux enterprise software development kit 12 sp5 | 0.6.32-32.12.3 | fixed |
| Suse | avahi | linux enterprise server 12 sp5 | 0.6.32-32.12.2 | fixed |
| Suse | avahi-glib2 | linux enterprise server 12 sp5 | 0.6.32-32.12.3 | fixed |
| Suse | avahi | linux enterprise server for sap applications 12 sp5 | 0.6.32-32.12.2 | fixed |
| Suse | avahi-glib2 | linux enterprise server for sap applications 12 sp5 | 0.6.32-32.12.3 | fixed |
| Suse | avahi-glib2 | linux enterprise workstation extension 12 sp5 | 0.6.32-32.12.3 | fixed |
| Opensuse | avahi | leap 15.2 | 0.7-lp152.3.6.1 | fixed |
| Opensuse | avahi-glib2 | leap 15.2 | 0.7-lp152.3.6.1 | fixed |
| Opensuse | avahi-mono | leap 15.2 | 0.7-lp152.3.6.1 | fixed |
| Opensuse | avahi-qt4 | leap 15.2 | 0.7-lp152.3.6.1 | fixed |
| Opensuse | avahi | leap 15.3 | 0.6.32-5.13.1 | fixed |
| Opensuse | avahi-glib2 | leap 15.3 | 0.6.32-5.13.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | avahi | source | sid | 0.8-4 | not yet assigned | Not reported | Not reported |
| Debian | avahi | source | forky | 0.8-4 | not yet assigned | Not reported | Not reported |
| Debian | avahi | source | trixie | 0.8-4 | not yet assigned | Not reported | Not reported |
| Debian | avahi | source | bookworm | 0.8-4 | not yet assigned | Not reported | Not reported |
| Suse | avahi | rpm | linux enterprise module for basesystem 15 sp2 | 0.7-3.6.1 | Not reported | SUSE-SU-2021:0551-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise module for basesystem 15 sp2 | 0.7-3.6.1 | Not reported | SUSE-SU-2021:0551-1 | Not reported |
| Suse | avahi | rpm | linux enterprise module for desktop applications 15 sp2 | 0.7-3.6.1 | Not reported | SUSE-SU-2021:0551-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise module for desktop applications 15 sp2 | 0.7-3.6.1 | Not reported | SUSE-SU-2021:0551-1 | Not reported |
| Suse | avahi | rpm | linux enterprise module for package hub 15 sp2 | 0.7-3.6.1 | Not reported | SUSE-SU-2021:0551-1 | Not reported |
| Suse | avahi | rpm | linux enterprise high performance computing 15-espos | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise high performance computing 15-espos | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi | rpm | linux enterprise high performance computing 15-ltss | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise high performance computing 15-ltss | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi | rpm | linux enterprise server 15-ltss | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise server 15-ltss | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi | rpm | linux enterprise server for sap applications 15 | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise server for sap applications 15 | 0.6.32-5.13.1 | Not reported | SUSE-SU-2021:1845-1 | Not reported |
| Suse | avahi | rpm | linux enterprise software development kit 12 sp5 | 0.6.32-32.12.2 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise software development kit 12 sp5 | 0.6.32-32.12.3 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi | rpm | linux enterprise server 12 sp5 | 0.6.32-32.12.2 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise server 12 sp5 | 0.6.32-32.12.3 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi | rpm | linux enterprise server for sap applications 12 sp5 | 0.6.32-32.12.2 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise server for sap applications 12 sp5 | 0.6.32-32.12.3 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Suse | avahi-glib2 | rpm | linux enterprise workstation extension 12 sp5 | 0.6.32-32.12.3 | Not reported | SUSE-SU-2021:0563-1 | Not reported |
| Opensuse | avahi | rpm | leap 15.2 | 0.7-lp152.3.6.1 | Not reported | OPENSUSE-SU-2021:0370-1 | Not reported |
| Opensuse | avahi-glib2 | rpm | leap 15.2 | 0.7-lp152.3.6.1 | Not reported | OPENSUSE-SU-2021:0370-1 | Not reported |
| Opensuse | avahi-mono | rpm | leap 15.2 | 0.7-lp152.3.6.1 | Not reported | OPENSUSE-SU-2021:0370-1 | Not reported |
| Opensuse | avahi-qt4 | rpm | leap 15.2 | 0.7-lp152.3.6.1 | Not reported | OPENSUSE-SU-2021:0370-1 | Not reported |
| Opensuse | avahi | rpm | leap 15.3 | 0.6.32-5.13.1 | Not reported | OPENSUSE-SU-2021:1845-1 | Not reported |
| Opensuse | avahi-glib2 | rpm | leap 15.3 | 0.6.32-5.13.1 | Not reported | OPENSUSE-SU-2021:1845-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [avahi-autoipd]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [avahi-daemon]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [avahi-discover]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· all · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· all · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [avahi-dnsconfd]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [avahi-ui-utils]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [avahi-utils]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [gir1.2-avahi-0.6]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-client3]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-client-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-common3]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-common-data]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-common-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-compat-libdnssd1]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-compat-libdnssd-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-core7]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-core-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-glib1]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-glib-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-gobject0]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- [libavahi-gobject-dev]Fixed
Source package: [avahi]
Details (2)
0.8-10+deb12u1· amd64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
0.8-10+deb12u1· arm64 · bookwormFixed · Fixed:
0.8-4dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2021_0551-1.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-26720]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-26720]
- [https://osv.dev/vulnerability/DLA-3047-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:0551-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:0563-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:1845-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-26720]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:0370-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:1845-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-26720]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]