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- The Firewall Cracks That Echo Across the Digital Landscape
The Firewall Cracks That Echo Across the Digital Landscape
Cisco’s ASA Zero Day Breach and the Wake Up Call for Network Defenders
Devona Green Jordan
September 27, 2025
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Interesting Tech Fact:
In 1994, one of the first commercial firewalls, the DEC SEAL (Secure External Access Link), was quietly deployed by Digital Equipment Corporation, and unlike today’s complex next-gen systems, it operated as a single-purpose gateway machine that blocked all internet traffic by default unless explicitly permitted—a radical concept at the time when most networks were still wide open. This “deny by default” stance, considered overly restrictive back then, actually laid the foundation for modern firewall rule sets and the principle of least privilege, making the DEC SEAL a forgotten yet pivotal ancestor in cybersecurity history.
