Avahi
CVE-2021-26720
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
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. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified under CWE-59. 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 products include: Avahi, Debian Debian Linux. Version information: through 0.8.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that a
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2
A vulnerability was found in the avahi library. Rated medium severity (CVSS 5.5), this vulnerability is low attack compl
A flaw was found in avahi 0.8-5. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. Public e
Avahi daemon versions 0.9rc2 and below can be remotely crashed through a denial of service attack by sending a specially
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2
A vulnerability was found in Avahi. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No ve
A vulnerability was found in Avahi. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No ve
A vulnerability was found in Avahi. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No ve
A vulnerability was found in Avahi. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No ve
A vulnerability was found in Avahi, where a reachable assertion exists in avahi_dns_packet_append_record. Rated medium s
Same weakness CWE-59 – Improper Link Resolution Before File Access
View allSame technique Denial Of Service
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External POC / Exploit Code
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