cwe-820-unsynchronized-access

To fix CWE-820 missing synchronization vulnerabilities in Java, you remediate unsynchronized access to shared mutable state by applying thread-safe programming patterns like AtomicInteger, ConcurrentHashMap, and synchronized blocks to prevent race conditions.

Unsynchronized access to shared mutable state in Java occurs when multiple threads concurrently read or write non-thread-safe collections without deterministic synchronization, causing data corruption and race conditions.

You make non-thread-safe collections thread-safe in Java by refactoring unsynchronized code to use deterministic thread-safe constructs like ConcurrentHashMap, ensuring data integrity and application stability during concurrent multi-threaded operations.

You need to use synchronized blocks for shared resources in Java when a SAST tool flags CWE-820 vulnerabilities involving complex multi-threaded operations, requiring deterministic code transformations to enforce thread safety and secure shared mutable state.

Remediating CWE-820 with AtomicInteger prevents race conditions in Java by replacing unsynchronized shared mutable state with secure, thread-safe code implementations, ensuring data integrity and application stability during concurrent access.

Limitations of using synchronized blocks for concurrent access issues in Java include potential performance bottlenecks in multi-threaded applications, making alternatives like AtomicInteger or ConcurrentHashMap necessary for deterministic remediation of unsynchronized shared mutable state.