What version of SMB does Windows 11 use? Currently, Windows 11/10 supports SMBv1, SMBv2, and SMBv3 as well. Different servers depending upon their configuration require a different version of SMB to get connected to a computer. But in case you are using Windows 8.1 or Windows 7, you can check if you have it enabled too.
How secure is SMB? In modern applications, you should NOT use SMB v1 because it is insecure (no encryption, has been exploited in attacks like WannaCry and NotPetya) and inefficient (very “chatty” on networks creating congestion and reduced performance).
Is SMBv1 still vulnerable? SMBv1 has a number of vulnerabilities that allow for remote code execution on the target machine. Even though most of them have a patch available and SMBv1 is no longer installed by default as of Windows Server 2016, hackers are still exploiting this protocol to launch devastating attacks.
What port does SMB use? SMB has always been a network file sharing protocol. As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.