CWE-693 (保护机制失效) — Vulnerability Class 321

CWE-693 represents a critical vulnerability where software fails to implement or correctly utilize necessary security controls, leaving systems exposed to directed attacks. This weakness manifests in two primary forms: missing mechanisms, where no defense exists for a specific threat vector, and insufficient mechanisms, where existing safeguards are inadequate or improperly configured. Attackers typically exploit these gaps by bypassing authentication, escalating privileges, or accessing sensitive data that should have been restricted. To mitigate this risk, developers must conduct rigorous threat modeling to identify all potential attack surfaces and ensure comprehensive security controls are in place. Regular code reviews and automated security testing help verify that protection mechanisms function as intended. By adopting a defense-in-depth strategy and validating that every security feature is both present and robust, organizations can significantly reduce the likelihood of exploitation and maintain the integrity of their applications.