cisco-sa-mdns-dos-3tH6cA9J: Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers Multicast DNS Denial of Service Vulnerability
First published: Thu Sep 24 2020(Updated: )
A vulnerability in the multicast DNS (mDNS) feature of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper validation of mDNS packets. An attacker could exploit this vulnerability by sending a crafted mDNS packet to an affected device. A successful exploit could cause a device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. Note: The Cisco Catalyst 9800 Series Wireless Controllers default configuration is vulnerable. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mdns-dos-3tH6cA9J This advisory is part of the September 24, 2020, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 34 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2020 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | ||
| Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers |
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Frequently Asked Questions
What is the severity of cisco-sa-mdns-dos-3tH6cA9J?
The cisco-sa-mdns-dos-3tH6cA9J vulnerability is rated as critical due to its potential to cause a denial of service.
How do I fix cisco-sa-mdns-dos-3tH6cA9J?
To fix cisco-sa-mdns-dos-3tH6cA9J, you should upgrade to the latest Cisco IOS XE Software or apply the relevant patches provided by Cisco.
Who is affected by cisco-sa-mdns-dos-3tH6cA9J?
The cisco-sa-mdns-dos-3tH6cA9J vulnerability affects Cisco Catalyst 9800 Series Wireless Controllers running Cisco IOS XE Software.
What type of attack is cisco-sa-mdns-dos-3tH6cA9J associated with?
The cisco-sa-mdns-dos-3tH6cA9J vulnerability is associated with denial of service (DoS) attacks.
Is authentication required to exploit cisco-sa-mdns-dos-3tH6cA9J?
No, cisco-sa-mdns-dos-3tH6cA9J can be exploited by unauthenticated remote attackers.
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