"PC or computers or hardware that uses OS that consume FreeBSD, has a faulty software for the router's firmware?"

"The router's software performs ad distributions?"

"The version of internet, the router uses, is updated, whereas, the target machine, or the user's machine is still running a old version"

"The security patch works for the modern but not the precursor version?"

"This leaves older systems obsolete in the market?"

"is this a step-by-step instructions to business owners to introduce new products, selling that older products are obsolete" ?

    vulnerable to remote code execution from
    systems on the same network segment

That would mean that every FreeBSD laptop in proximity of an attacker is vulnerable, right? Since the attacker could just create a hotspot with the SSID "Starbucks" on their laptop and the victim's laptop will connect to it automatically.

Anyways, this feels like a big issue for "hidden" FreeBSD installs, like pfSense or TrueNAS (if they are still based on it though). Or for servers on hosting providers where they share a LAN with their neighbors in the same rack.

And it's a big win for jailbreaking routers :D