EchoLife HG8245Q2 port 23 open

Hello, friend!
What I see is that port 23 is disabled by default. Have you enabled port 23? and how did you confirm that?

No I got this router from my isp couple of weeks ago when upgraded to 5g network. For no reason at all i did an nmap scan on it and these are the results of that scan:
"PORT      STATE    SERVICE
21/tcp    filtered ftp
22/tcp    filtered ssh
23/tcp    open     telnet
53/tcp    open     domain
80/tcp    open     http
49152/tcp open     unknown". After that I managed to get shell access to it via telnet. I have done absolutely nothing to the router default state! Is there a firmware update for this model?

Hello, friend!

Based on the information you provided, I found no misinformation related to this issue.

According to the ISP information and device information, I came to the conclusion that port 23 of the HG8245Q2 is enabled by default and cannot be disabled.

The WAN-side access port is closed, and the default LAN-side telnet is closed. Even if 23 port is open, the port cannot be accessed through external systems. Therefore, the security problem does not exist.

Thanks!