CVE-2021-26720 (GCVE-0-2021-26720)
Vulnerability from cvelistv5 – Published: 2021-02-17 21:19 – Updated: 2024-08-03 20:33
VLAI
EPSS
VEX
Summary
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.
Severity
7.8 (High)
CWE
- n/a
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://packages.debian.org/buster/avahi-daemon | x_refsource_MISC |
| https://packages.debian.org/sid/avahi-daemon | x_refsource_MISC |
| https://packages.debian.org/bullseye/avahi-daemon | x_refsource_MISC |
| https://security-tracker.debian.org/tracker/CVE-2… | x_refsource_MISC |
| https://bugs.launchpad.net/ubuntu/+source/avahi/+… | x_refsource_MISC |
| https://metadata.ftp-master.debian.org/changelogs… | x_refsource_MISC |
| https://www.openwall.com/lists/oss-security/2021/… | x_refsource_MISC |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug… | x_refsource_MISC |
| https://bugzilla.suse.com/show_bug.cgi?id=1180827 | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
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Advisory\"]},{\"url\":\"https://packages.debian.org/sid/avahi-daemon\",\"source\":\"cve@mitre.org\",\"tags\":[\"Product\",\"Third Party Advisory\"]},{\"url\":\"https://security-tracker.debian.org/tracker/CVE-2021-26720\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.openwall.com/lists/oss-security/2021/02/15/2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://bugzilla.suse.com/show_bug.cgi?id=1180827\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Broken Link\",\"Third Party Advisory\"]},{\"url\":\"https://packages.debian.org/bullseye/avahi-daemon\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\",\"Third Party Advisory\"]},{\"url\":\"https://packages.debian.org/buster/avahi-daemon\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\",\"Third Party Advisory\"]},{\"url\":\"https://packages.debian.org/sid/avahi-daemon\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\",\"Third Party Advisory\"]},{\"url\":\"https://security-tracker.debian.org/tracker/CVE-2021-26720\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.openwall.com/lists/oss-security/2021/02/15/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"current_release_date": "2026-03-27T14:28:22+00:00",
"cve": "CVE-2021-26720",
"id": "CVE-2021-26720",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2021-26720",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-26720.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-08T00:20:55Z",
"cve": "CVE-2021-26720",
"id": "CVE-2021-26720",
"initial_release_date": "2023-02-15T03:44:37Z",
"product_status:known_affected": "293",
"product_status:known_not_affected": "712",
"product_status:recommended": "1268",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-26720",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-26720.json",
"version": "51"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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