Port 5555 Open

3Gee

3Gee

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One of my Smart Home devices opens
Port 5555 on my local network

There is nothing under port forwarding on my Router.

Is it safe to have Port 5555 open on your local network?
 
What do you mean it opens it on your network?
I assume you mean that device listens on port 5555.
Whether that is safe or not is not dependent on the port but rather what services run on it. You could run ssh or ssl on port 5555 with multi factor authentication and it would be considered secure or you could run telnet with default username and password of admin and it would be insecure.

If you are not port forwarding from the internet then you only have to worry about your internal network which would drastically reduce the attack surface.

If it is breaking out on port 5555 and possibly creating a reverse tunnel then you might be really worried about that.

It really is all about what is happening on that port rather than the port itself.
 
Go to you.rpu.bip:5555 see if you get your router login page? ie 169.2.33.33:5555

Old TP-Link routers was accessible via that port via the internet
 
MavChat said:
Go to you.rpu.bip:5555 see if you get your router login page? ie 169.2.33.33:5555

Old TP-Link routers was accessible via that port via the internet
Click to expand...

"Cannot open the page because the network connection was lost "
 
3Gee said:
When running a port scan on my router , 5555 does not appear
Click to expand...
I dont see why it would. The router does not have port 5555 open and if you wanted to test you would need to from the internet to see if port 5555 is exposed and port forwarded. But you have confirmed from the configuration it is not.
Again, focus on what the actual service is running on port 5555 on the smart device and then narrow down from there the security risk. The port number is not particularly relevant (although it sometimes can lend itself to certain protocols)
 
syntax said:
I dont see why it would. The router does not have port 5555 open and if you wanted to test you would need to from the internet to see if port 5555 is exposed and port forwarded. But you have confirmed from the configuration it is not.
Again, focus on what the actual service is running on port 5555 on the smart device and then narrow down from there the security risk. The port number is not particularly relevant (although it sometimes can lend itself to certain protocols)
Click to expand...

What i have done is paused all data through the device.
Automations are still working and i can still manually control it with Homekit.
 
3Gee said:
One of my Smart Home devices opens
Port 5555 on my local network

There is nothing under port forwarding on my Router.

Is it safe to have Port 5555 open on your local network?
Click to expand...

It's safe.

Local network is only accessible to local computers / devices.
I tend to trust equipment on my local network, as I own it.

I do make vlan's for my IoT crap though, so they can't talk to other stuff "just in case".

Just make sure upnp isn't forwarding that port on your router, and that that port isn't accessible on your wan ip.

whatsmyip.com or similar will give you your wan ip address. You can scan that with a network scanner eg https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap#
or https://www.ipvoid.com/port-scan/ (check 5555 )

If anything is open, then you can configure your router appropriately not to open sesame..

Conversely if you do need remote access to your lan, I find wireguard quite good. (eg install on a desktop and a laptop for remote access when out of the huis).
 
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