"Not only was the bug specific to the PDP-11/70, a system that entered service in 1975, but it also requires a Precision Standard Time, Inc.(PSTI) receiver manufactured by defunct hardware maker Traconex used to pick up time signals broadcast by short wave radio stations managed by the US National Institute of Standards and Technology. Even at that point, the bug won't instantly break network time, as a would-be attacker must take several steps to configure the ancient mahicnes in a way that causes the error."
Oh wow. That's a niche within a niche within a niche.