A vulnerability in the Cisconbsp;Umbrella Integration feature of Cisconbsp;IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of servicenbsp;(DoS) condition.

The vulnerability is due to a logic error that exists when handling a malformed incoming packet, leading to access to an internal data structure after it has been freed.

An attacker could exploit this vulnerability by sending crafted, malformed IP packets to an affected device.

A successful exploit could allow the attacker to cause an affected 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.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-opendns-dos
This advisory is part of the March 28, 2018, release of the Cisconbsp;IOS and IOSnbsp;XE Software Security Advisory Bundled Publication, which includes 20 Cisco Security Advisories that describe 22 vulnerabilities.

For a complete list of the advisories and links to them, see Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Security Impact Rating: High

CVE: CVE-2018-0170

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