API Rate Limiting Bypass
Missing or improperly implemented rate limiting allows attackers to make unlimited API requests. This enables brute-force attacks, data scraping, resource exhaustion, and denial of service.
Overview
Rate limiting is essential for API security but is frequently missing or improperly implemented. Attackers can exploit this to perform brute-force attacks, scrape data at scale, exhaust server resources, or inflate costs for pay-per-use services. Common bypass techniques include using multiple IP addresses, rotating API keys, or exploiting inconsistencies between rate limiting layers.
Impact
Brute-force attacks, data scraping, denial of service, resource abuse, cost inflation (for pay-per-use APIs).
Remediation
Implement rate limiting per user/IP/API key, use token bucket or sliding window algorithms, return 429 status codes, and apply different limits for authenticated vs. unauthenticated users.
Implement rate limiting on all API endpoints
Use sliding window or token bucket algorithms
Rate limit by user identity, not just IP address
Return 429 Too Many Requests with Retry-After header
Apply stricter limits on sensitive endpoints (login, password reset)
Related SuperClue scanner checks
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