Vulnarex | Elite Cybersecurity Learning Platform

#Lack of Rate Limiting in APIs#link

APIs without rate limiting are vulnerable to brute force attacks, credential stuffing, enumeration, and resource exhaustion (DoS). This maps to OWASP API4:2023 — Unrestricted Resource Consumption.

Testing for Missing Rate Limits

Sandbox Client Frame

root@vulnarex:~## Brute force OTP endpoint with no rate limiting for i in $(seq 1000 9999); do curl -s -X POST https://api.target.com/verify \ -d "{\"otp\": \"$i\"}" | grep -i 'success' done

callout

💡 Always test OTP/2FA endpoints, password reset endpoints, and login endpoints for missing rate limiting. These are consistently found in bug bounty programs.

quiz BLOCK (★ 50 XP)

Which attack is most directly enabled by missing rate limiting on a login API endpoint?

Select your proof vectors above

Rate Limiting and Resource Abuse

#Lack of Rate Limiting in APIs#link

Testing for Missing Rate Limits

Which attack is most directly enabled by missing rate limiting on a login API endpoint?

Verification Proof Checkpoint