This indicates an attempt to exploit the Denial-of-Service (DoS) vulnerability in PacketTrap TFTP Server.
A remote attacker can send crafted writing request that contains illegal characters to crash the vulnerable TFTP server and cause denial-of-service.
PacketTrap TFTP Server 2.2.5459.0 DoS
Denial of Service: Remote attackers can crash vulnerable systems.
Currently, we are not aware of any vendor supplied patch for this issue.