[smokingfrog]

Some device on your network may not be up to date?

[LouAvul]

BTW. One of my desktops is running Microsoft Security Essentials and, when I run that scan, I get no such warnings as I do with Avast.

Also, one of the laptops is running AVG. When I run a scan on that computer, ditto, no warning.

[PJBankard]

https://blog.avast.com/2014/11/04/avast-2015-new-feature-home-network-security-scanning/

Read that. I am assuming that you are running the network security scan.

[rarestia]

What device is it saying is vulnerable? This could be anything from an open port on the network to a protocol-based exploit. Does Avast provide any guidance on what’s being scanned?

[proxy_user]

But by putting a strong password on your network, you have prevented any unauthorized hackers from getting on to attack you. Avast can’t know this, all it sees is the local machine.

[rarestia]

One thing you might check is if UPnP is enabled on the router/switch. UPnP is often enabled by default on consumer-grade routers, and it’s a BIG target for exploits.

[Governor Dinwiddie]

Run a scan on all your tcp ports at GRC Shields Up. They are a highly respected security outfit and will scan all your ports remotely. Takes less than a minute. A simple color coded chart will be displayed at the end of the test to show you which ports might be problematic. If everything in the test comes out green, then that is a good sign.