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    CVE-2024-20303

    A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper management of mDNS client entries. An attacker could exploit this vulnerability by connecting to the wireless network and sending a continuous stream of specific mDNS packets. A successful exploit could allow the attacker to cause the wireless controller to have high CPU utilization, which could lead to access points (APs) losing their connection to the controller and result in a DoS condition.

    Published:Mar 27, 2024
    Last Modified:Jul 31, 2025
    EPS:Mar 27, 2024
    EPSS Score:0.001
    CVSS Score:7.4

    Affected Products

    Vendor
    Cisco
    Product
    Catalyst 9105axi
    Vendor
    Cisco
    Product
    Catalyst 9115axe
    Vendor
    Cisco
    Product
    Catalyst 9115axi
    Vendor
    Cisco
    Product
    Catalyst 9117axi
    Vendor
    Cisco
    Product
    Catalyst 9120axe
    Vendor
    Cisco
    Product
    Catalyst 9120axi
    Vendor
    Cisco
    Product
    Catalyst 9120axp
    Vendor
    Cisco
    Product
    Catalyst 9130axe
    Vendor
    Cisco
    Product
    Catalyst 9130axi
    Vendor
    Cisco
    Product
    Catalyst 9800-40
    Vendor
    Cisco
    Product
    Catalyst 9800-80
    Vendor
    Cisco
    Product
    Catalyst 9800-cl Wireless Controllers For Cloud
    Vendor
    Cisco
    Product
    Catalyst 9800-l
    Vendor
    Cisco
    Product
    Catalyst Cw9800h1
    Vendor
    Cisco
    Product
    Catalyst Cw9800h2
    Vendor
    Cisco
    Product
    Catalyst Cw9800m
    Vendor
    Cisco
    Product
    Ios Xe

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-459 Incomplete Cleanup

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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