What can be done with the network and devices connected to it, having access to the router (router)?

Question

Computer networks

Hello. Recently I was interested in a question, but I could not really find an answer to it. What can an intruder do that has gained access to the router (entered "admin" in the login and password :) )? Somewhere else I heard the phrase: "I got access to the router and sent a virus pointwise to the ip address . " I just recently started to study the topic of networks, so please answer my question!

Answer 1

Can download the firmware to your router from offsite, change it and flash your router.

Answer 2

Create a botnet (99% of the cases, why do routers break)
Stir up a MIM attack, and for unencrypted connections, simply intercept the traffic of your devices and do something with them

Answer 3

if the router is advanced (such as Mikrotik), then it can make itself a VPN through it and shit, framing you

Answer 4

Much depends on the purpose for which it was done. If they opened it simply because they opened it - usually the router is harnessed to a botnet, to spoil other people. If they opened it without a purpose, harness it to a botnet - well, they can stir up MitM, view traffic.
If it was purposefully opened, then again MitM, viewing unencrypted traffic, local analysis - maybe you have video surveillance in your bedroom there :) It is also possible to try to intercept VPN connections, if any.
Rare, but possible (requiring a combination of a considerable number of factors) - You have children and video surveillance of them. Guess from three times why the attacker will need access (if he is a pervert, for example)