How to Secure Legacy Systems and Shrink Security Debt: Enterprise Guide to Protecting Complex Environments

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Nearly half of large global enterprises rank legacy systems as a top cyber resilience challenge, according to the World Economic Forum’s Global Cybersecurity Outlook – and 70% of the software used by Fortune 500 companies was developed 20+ years ago. Over time, security and technical debt accumulate, legacy systems become deeply embedded in critical operations, and new or unpatched vulnerabilities across legacy-heavy infrastructure put uptime at risk. Traditional security strategies that require re-architecting or deploying agents can’t solve this problem without introducing new issues – instead, enterprises need a containment layer that integrates with the existing environment. We’ll walk through the legacy system security challenges organizations face today, what it takes to protect complex environments in the AI era, and best practices for building a self-defending architecture without risking business continuity. - What security risks do legacy-heavy enterprises face? Enterprises with complex, legacy-heavy environments face risks like unpatched vulnerabilities, broad attacker surfaces and lateral movement exposure, limited visibility into operational dependencies, and lack of integration with modern security tools. As a result, attackers often target legacy systems as an initial access vector and a lateral movement pivot point.

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