SANS Institute - tftp

=Description=
TFTP is a simple protocol used for transferring files. It is used most often in conjunction with the Trivial User Datagram Protocol (UDP). TFTP has been implemented on a wide variety of platforms, including Unix-like operating systems, Microsoft Windows, the Plan 9 operating system, and Cisco routers.

The protocol is very basic, and does not provide any security features. This makes it vulnerable to tampering and spoofing.=More Information=
https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol