Cisco has released free software updates that address the vulnerability described in this advisory. 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. Customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release.”]
Source: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-uccx-rce-GMSC6RKN