A common pc running bash
inside a home LAN network (with a router/gateway providing internet access to the LAN) does not have any contact with the external internet, except browser navigation and the mailreader (with no port forward in the router and with a secure DHCP server).
If no one from inside the LAN does attack that pc, is it anyway vulnerable to Shellshock due to external attacks? In other words: could an external attacker exploit the internet navigation or the mail reading/sending in order to penetrate that host in the LAN?