CWE-833 (死锁) — Vulnerability Class 17

CWE-833 represents a concurrency weakness where multiple threads or executable segments become permanently blocked because each waits for a lock held by another, creating a circular dependency. This condition typically arises not through external exploitation, but as an unintended consequence of poor synchronization logic, leading to application hangs or denial of service. Attackers may indirectly leverage this by triggering specific race conditions that force the system into this deadlocked state, effectively disrupting service availability. To prevent such vulnerabilities, developers must implement strict lock ordering protocols, ensuring all threads acquire resources in a consistent global sequence. Additionally, utilizing timeout mechanisms for lock acquisition and employing higher-level concurrency abstractions like mutexes with non-blocking attempts can mitigate the risk. Rigorous testing under high-concurrency scenarios is also essential to identify and resolve potential circular dependencies before deployment.