Cisco Security Advisory - Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability

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Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability

A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to insufficient input validation of incoming mDNS traffic. An attacker could exploit this vulnerability by sending a crafted mDNS packet to an affected device through a wireless network that is configured in FlexConnect local switching mode or through a wired network on a configured mDNS VLAN. A successful exploit could allow the attacker to cause the access point (AP) to reboot, resulting in a DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-mdns-dos-E6KwYuMx

     
         
Security Impact Rating:  High
   
   
       
CVE: CVE-2021-1439
Source: Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability