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    CVE-2021-3502

    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.

    Published:Mar 29, 2021
    Last Modified:Nov 21, 2024
    EPS:May 7, 2021
    EPSS Score:0.00032
    CVSS Score:5.5

    Affected Products

    Vendor
    Avahi
    Product
    Avahi
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://bugzilla.redhat.com/show_bug.cgi?id=1946914https://github.com/lathiat/avahi/issues/338https://bugzilla.redhat.com/show_bug.cgi?id=1946914https://github.com/lathiat/avahi/issues/338

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2025-68471 (CVSS 6.5) — Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. I…
    CVE-2025-68468 (CVSS 6.5) — Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. I…
    CVE-2025-68276 (CVSS 5.5) — Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. I…
    CVE-2025-59529 (CVSS 5.5) — Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. I…
    CVE-2023-38471 (CVSS 6.2) — A vulnerability was found in Avahi. A reachable assertion exists in the dbus_set_host_name function.…
    CVE-2023-38472 (CVSS 6.2) — A vulnerability was found in Avahi. A reachable assertion exists in the avahi_rdata_parse() function.…
    CVE-2023-38469 (CVSS 6.2) — A vulnerability was found in Avahi, where a reachable assertion exists in avahi_dns_packet_append_record.…
    CVE-2023-38470 (CVSS 6.2) — A vulnerability was found in Avahi. A reachable assertion exists in the avahi_escape_label() function.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High