Avahi
CVE-2021-3502
MEDIUM
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N/I:N/A:H
Lifecycle Timeline
1DescriptionNVD
A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
AnalysisAI
A flaw was found in avahi 0.8-5. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. Public exploit code available and no vendor patch available.
Technical ContextAI
This vulnerability is classified under CWE-617. A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability. Affected products include: Avahi.
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
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-d
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-617 – Reachable Assertion
View allSame technique Denial Of Service
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External POC / Exploit Code
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