The cyber perimeter was never dead. We just abandoned it.

The notion that the network perimeter is dead is a dangerous myth. Organizations have neglected edge hardware—firewalls, routers, remote access appliances—letting end-of-life devices become persistent footholds for adversaries. The FBI's Operation Winter SHIELD and CISA's Binding Operational Directive 26-02 together represent a federal acknowledgment of this governance failure. BOD 26-02 mandates federal agencies remove unsupported edge devices within 18 months, while Winter SHIELD targets weak authentication, excessive privileges, and unpatched systems. CISOs are urged to enforce hardware-based authentication, limit admin rights, patch critical flaws within 72 hours, maintain full device inventories, and establish lifecycle management processes. Neglecting the perimeter undermines every other security investment.