cisco-sa-aironet-mdns-dos-E6KwYuMx: Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability
First published: Wed Mar 24 2021(Updated: )
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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-mdns-dos-E6KwYuMx
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Catalyst 9800 Wireless Controller Software | =17.3<17.3.3 | 17.3.3 |
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Frequently Asked Questions
What is the vulnerability ID of this Cisco Aironet Access Points vulnerability?
The vulnerability ID is cisco-sa-aironet-mdns-dos-E6KwYuMx.
What is the title of this vulnerability?
The title of this vulnerability is Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability.
What is the severity rating of the vulnerability?
The severity rating of this vulnerability is high, with a CVSS score of 7.4.
Which Cisco software or product is affected by this vulnerability?
The Cisco Catalyst 9800 Wireless Controller Software version 17.3 up to exclusive 17.3.3 is affected by this vulnerability.
How can an unauthenticated attacker exploit this vulnerability?
An unauthenticated attacker can exploit this vulnerability by sending malicious multicast DNS (mDNS) traffic to the affected device, causing a denial of service (DoS) condition.
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