high
8.6
CWE
400 388
Advisory Published
Updated

CVE-2020-3510: Cisco IOS XE Software for Catalyst 9200 Series Switches Umbrella Connector Denial of Service Vulnerability

First published: Thu Sep 24 2020(Updated: )

A vulnerability in the Umbrella Connector component of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches could allow an unauthenticated, remote attacker to trigger a reload, resulting in a denial of service condition on an affected device. The vulnerability is due to insufficient error handling when parsing DNS requests. An attacker could exploit this vulnerability by sending a series of malicious DNS requests to an Umbrella Connector client interface of an affected device. A successful exploit could allow the attacker to cause a crash of the iosd process, which triggers a reload of the affected device.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XE=16.12.1
Cisco IOS XE=16.12.2
Cisco IOS XE=17.1.1
Cisco Catalyst C9200-24p
Cisco Catalyst C9200-24t
Cisco Catalyst C9200-48p
Cisco Catalyst C9200-48t
Cisco Catalyst C9200l-24p-4g
Cisco Catalyst C9200l-24p-4x
Cisco Catalyst C9200l-24pxg-2y
Cisco Catalyst C9200l-24pxg-4x
Cisco Catalyst C9200l-24t-4g
Cisco Catalyst C9200l-24t-4x
Cisco Catalyst C9200l-48p-4g
Cisco Catalyst C9200l-48p-4x
Cisco Catalyst C9200l-48pxg-2y
Cisco Catalyst C9200l-48pxg-4x
Cisco Catalyst C9200l-48t-4g
Cisco Catalyst C9200l-48t-4x
Cisco Catalyst C9300-24p
Cisco Catalyst C9300-24s
Cisco Catalyst C9300-24t
Cisco Catalyst C9300-24u
Cisco Catalyst C9300-24ux
Cisco Catalyst C9300-48p
Cisco Catalyst C9300-48s
Cisco Catalyst C9300-48t
Cisco Catalyst C9300-48u
Cisco Catalyst C9300-48un
Cisco Catalyst C9300-48uxm
Cisco Catalyst C9300l-24p-4g
Cisco Catalyst C9300l-24p-4x
Cisco Catalyst C9300l-24t-4g
Cisco Catalyst C9300l-24t-4x
Cisco Catalyst C9300l-48p-4g
Cisco Catalyst C9300l-48p-4x
Cisco Catalyst C9300l-48t-4g
Cisco Catalyst C9300l-48t-4x
Cisco Catalyst C9404r
Cisco Catalyst C9407r
Cisco Catalyst C9410r
Cisco Catalyst C9500-12q
Cisco Catalyst C9500-16x
Cisco Catalyst C9500-24q
Cisco Catalyst C9500-24y4c
Cisco Catalyst C9500-32c
Cisco Catalyst C9500-32qc
Cisco Catalyst C9500-40x
Cisco Catalyst C9500-48y4c
Cisco Catalyst C9600-lc-24c
Cisco Catalyst C9600-lc-48s
Cisco Catalyst C9600-lc-48tx
Cisco Catalyst C9600-lc-48yl

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-3510?

    CVE-2020-3510 is a vulnerability in the Umbrella Connector component of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches that could allow an unauthenticated, remote attacker to trigger a reload, resulting in a denial of service condition on an affected device.

  • What is the severity of CVE-2020-3510?

    The severity of CVE-2020-3510 is rated as high with a CVSS score of 8.6.

  • What software versions are affected by CVE-2020-3510?

    The affected software versions are Cisco IOS XE 16.12.1, 16.12.2, and 17.1.1.

  • How can an attacker exploit CVE-2020-3510?

    An attacker can exploit CVE-2020-3510 by sending specially crafted network traffic to the vulnerable device.

  • Is there a fix for CVE-2020-3510?

    Yes, Cisco has released software updates to address the vulnerability. Please refer to the Cisco security advisory for more information.

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