User and network enumeration attacks help adversaries plan strong attack campaigns. Prevent them with MFA, rate limiting, CAPTCHA, secure code and more.

Web applications are subject to a variety of attacks, ranging from basic to sophisticated. A common technique for malicious actors is user or network enumeration attacks, which are designed to brute-force login systems to test whether usernames, email addresses and accounts are valid. Adversaries use enumeration attacks as reconnaissance to gather information for future attacks.

Let's take a deeper look at how these attacks work and how to prevent them.