CWE-362 Race Condition

Description

Race Condition

Reference: https://cwe.mitre.org/data/definitions/362.html

OWASP Category: A04:2021 – Insecure Design

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Vulnerable Pattern

❌ Example 1: Vulnerable Pattern

// VULNERABLE: Race condition in check-then-act
private int counter = 0;

public void increment() {
    if (counter < MAX_VALUE) {
        counter++; // Race condition
    }
}

Why it's vulnerable: This pattern is vulnerable to Race Condition

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Deterministic Fix

✅ Secure Implementation: Secure Implementation

// SECURE: Use AtomicInteger for thread-safe operations
private AtomicInteger counter = new AtomicInteger(0);

public void increment() {
    counter.updateAndGet(c -> Math.min(c + 1, MAX_VALUE));
}

// Or use synchronization
private final Object lock = new Object();
public void incrementSynchronized() {
    synchronized (lock) {
        if (counter < MAX_VALUE) {
            counter++;
        }
    }
}

Why it's secure: Implements proper protection against Race Condition

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Detection Pattern

Look for these patterns in your codebase:

# Find unsynchronized increment
grep -rn "++\\|--" --include="*.java" | grep -v "synchronized\\|Atomic"

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Remediation Steps

1. Use atomic variables for simple counters

2. Use synchronized blocks for complex operations

3. Consider using concurrent collections

4. Use ReentrantLock for more control

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Key Imports

import java.util.concurrent.atomic.AtomicInteger;

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Verification

After remediation:

• Run SAST scanner to confirm vulnerability is resolved

• Review all instances of the vulnerable pattern

• Add unit tests that verify the secure implementation

• Check for similar patterns in related code

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Trigger Examples

Fix CWE-362 vulnerability
Resolve Race Condition issue
Secure this Java code against race condition
SAST reports CWE-362

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Common Vulnerable Locations

Layer	Files	Patterns

| Controller | *Controller.java | User input handling |

| Service | *Service.java | Business logic |

| Repository | *Repository.java | Data access |

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References

• CWE-362: Race Condition

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Source: Generated by Java CWE Security Skills Generator Last Updated: 2026-03-07