CWE-407 (算法复杂性) — Vulnerability Class 91

CWE-407 represents a software weakness characterized by inefficient algorithmic complexity, specifically where worst-case computational performance is unexpectedly poor. This vulnerability is typically exploited by attackers who craft specific inputs designed to trigger these worst-case scenarios, thereby causing denial of service or significant system degradation. By forcing the application to consume excessive CPU resources or memory, adversaries can disrupt service availability for legitimate users. To mitigate this risk, developers must prioritize algorithmic efficiency during the design phase, selecting data structures and logic that maintain consistent performance regardless of input characteristics. Rigorous testing with edge cases and fuzzing helps identify potential bottlenecks, while code reviews ensure that complex operations do not introduce quadratic or exponential time complexities that could be weaponized against the system.