Port 22 SSH Enum and Attacking

Check for SSH version and associated vulnerabilities in software

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Password Cracking

If you find any valid user names via other methods

Try cracking password using HYDRA

Example:

hydra -l sunny -P '/usr/share/wordlists/rockyou.txt' 10.10.10.76 ssh -s 22022

where sunny is the valid user name found during enum