Note that firewalls, both the classic and digital versions, are designed to delay for a period of time, not completely stop the danger on the other side. Given enough time without any changes to the firewall, it can be breached (either through intense fire or novel digital attack it's software hasn't been made aware of).
muthian t1_iuawfc1 wrote
Reply to comment by DarkAlman in eli5: What is a firewall? by This_Caterpillar_330
Note that firewalls, both the classic and digital versions, are designed to delay for a period of time, not completely stop the danger on the other side. Given enough time without any changes to the firewall, it can be breached (either through intense fire or novel digital attack it's software hasn't been made aware of).