They did the same with datacenter gear (Cisco) was a major target of that too.
The gov created a special "secret" office just to randomly pull hardware that was bought new or already operating to do forensics on it. To my knowledge they never published real numbers on how much they found to be backdoored but I imagine that it is a LOT worse than any of us would guess.
This is what firewalls are for, but no consumer uses them.
Kind of a big fucking problem when your damn firewall is backdoored man.
Do you know what CISCO does?
Yeah. I've been a sysadmin for fifteen years. That's why I don't like appliances and prefer to roll my own solution at home. Sucks to suck if work shit is affected, but that's their decision, not mine.