This indicates an attack attempt against a buffer-overflow vulnerability in Motorola Timbuktu Pro.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted request sent to the PlughNTCommand named pipe. It allows a remote attacker to execute arbitrary code.
Motorola Timbuktu Pro 8.6.5
Motorola Timbuktu Pro 220.127.116.117
Upgrade to a non-vulnerable version: