8.6
CWE
20
Advisory Published
Updated

CVE-2020-3359: 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XE=16.12.1
Cisco 2610xm
Cisco 2611xm
Cisco 2612
Cisco 2620xm
Cisco 2621xm
Cisco 2650xm
Cisco 2651xm
Cisco 2691
Cisco Catalyst 9800-40
Cisco Catalyst 9800-80
Cisco Catalyst 9800-cl
Cisco Catalyst 9800-l
Cisco Catalyst 9800-l-c
Cisco Catalyst 9800-l-f

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Frequently Asked Questions

  • What is the vulnerability ID for this Cisco IOS XE Software vulnerability?

    The vulnerability ID for this Cisco IOS XE Software vulnerability is CVE-2020-3359.

  • What is the severity level of CVE-2020-3359?

    CVE-2020-3359 has a severity level of 8.6 (high).

  • What is the affected software for CVE-2020-3359?

    The affected software for CVE-2020-3359 is Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers version 16.12.1.

  • How can an attacker exploit CVE-2020-3359?

    An attacker can exploit CVE-2020-3359 by sending malicious multicast DNS packets to the vulnerable device.

  • Is there a fix available for CVE-2020-3359?

    Yes, Cisco has released a security advisory with mitigation details for CVE-2020-3359. Please refer to the official advisory for more information.

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