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TFTP uses UDP port 69 and requires no authentication—clients read from, and write to servers using the datagram format outlined in RFC 1350. Due to deficiencies within the protocol (namely lack of authentication and no transport security), it is uncommon to find servers on the public Internet. Within large internal networks, however, TFTP is used to serve configuration files and ROM images to VoIP handsets and other devices.
Default Port: 69/UDP
PORT STATE SERVICE REASON
69/udp open tftp script-set
TFTP doesn't provide directory listing so the script
nmapwill try to brute-force default paths.
nmap -n -Pn -sU -p69 -sV --script tftp-enum <IP>
You can use Metasploit or Python to check if you can download/upload files:
client = tftpy.TftpClient(<ip>, <port>)
client.download("filename in server", "/tmp/filename", timeout=5)
client.upload("filename to upload", "/local/path/file", timeout=5)