How to check if the router is hacked?

Question

network hardware

Can they connect to the router from the external Internet (outside lan / wifi) knowing the username and password of the router's admin panel and cram sniffers there?
The login and password were by default for a long time, along with a static Ip and an ancient firmware (updated) - in theory, I can be a victim of a mass attack on routers and not know it until now
And how to check for trojans, sniffers in the router? And how to cure without knowing for sure? (update the firmware?)
Sometimes I notice that dns falls off when using 4g Internet through a router (pages do not open the first time or do not open at all, while ping over IP responds), while when using the modem directly, there is no such problem. There was no interference with https

Answer 1

What is the brand and model of the router? If there is a vulnerability for the router and it can be exploited, then it does not matter what the password is. The router could be part of a botnet, or used to commit illegal actions with its help (as an example, the case of the mathematician D. Bogatov is true there is a torus, but you can still see the parallels). To cure, it is necessary to update the firmware constantly. How to check the presence of sniffers and other things, you need to check what scripts have appeared, the settings have changed, reverse the firmware, compare it with the original from the manufacturer, and there may be a zero in the protocol, in the implementation of the frontend, there are organizations that deal with this (for example , https:// neobit.ru/services/audit and the like). What about dns here I do not know.

Answer 2

Check - maybe nothing, but cure - update the firmware, reset to factory settings and configure from scratch

Answer 3

There is such a program: Router Scan , it just allows you to scan the IP of routers and try to hack them using known vulnerabilities and security holes.
Oddly enough, many routers break down in this way. After that, they are used as free VPN servers and proxy servers, for example, or even replace DNS servers with their own (this way you can change the addresses of well-known sites).
In general, I strongly advise you to check this program.

Answer 4

Hey, looks like my router was hacked.
For some reason, the picture with this trouble is not inserted, writes "Failed to load the file"
Flashing does not help.