Hydra

Hydra is an open-source parallelized network logon cracker that performs brute-force attacks to test authentication mechanisms across numerous protocols including SSH, FTP, HTTP, HTTPS, Telnet, RDP, MySQL, PostgreSQL, and over 50 other services by systematically testing username and password combinations from wordlists or custom dictionaries. The tool is designed for authorized penetration testing and security auditing to identify weak credentials and authentication vulnerabilities, enabling security professionals and system administrators to assess password strength and improve security posture before malicious actors can exploit these weaknesses.