Cisco has released free software updates that address the vulnerability described in this advisory. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. Customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased.”]
Source: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180516-msms