There are no workarounds that address this vulnerability.
Customers with coresident deployments of Cisco Prime License Manager as part of Cisco Unified Communications Manager or Cisco Unity Connection who do not use PLM can disable the feature to close the attack vector as follows:
Log in to the Cisco Unified Communications Manager or Cisco Unity Connection CLI as admin user.
Run the command license management system remove.
Confirm with y.
Wait for the operation to complete; afterwards, the system will reboot automatically.
Note: This procedure needs to be executed on all nodes in a cluster. It will persist across upgrades.