BSD is very popular for open router ecosystems, like pfSense, opnSense.
Some more commercial ones (pfsense is commercial) use it too like juniper junos.
Some more commercial ones (pfsense is commercial) use it too like juniper junos.
Any router/switch is going to be running an ancient Linux kernel, which isn't patched. EdgeOS for example, won't be patched. The old Brocade/Ruckus switches I got here, won't have this patched. I'm holding my breath for my Unifi APs.