This indicates an attack attempt to exploit an Elevation of Privilege vulnerability in TeamViewer.
The vulnerability is due to an error when the vulnerable system handles a connection after injection of a malicious DLL onto the system. A remote attacker may be able to exploit this to elevate their privileges to gain control of the keyboard and mouse of the target system.
TeamViewer version 12 or prior
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable sys
Apply the most recent upgrade or patch from the vendor.