![]() Cybercriminals can exploit these ports through: Server Message Block (SMB) uses port 445 directly and ports 137 and 139 indirectly. ![]() Ports 137 and 139 (NetBIOS over TCP) and 445 (SMB) This port is particularly vulnerable to DDoS attacks. It’s a UDP and TCP port for queries and transfers, respectively. Without proper configuration and protection, this TCP port is vulnerable to spoofing and spamming. Port 25 is a Simple Mail Transfer Protocol (SMTP) port for receiving and sending emails. Since it’s outdated and insecure, it’s vulnerable to many attacks, including credential brute-forcing, spoofing and credential sniffing. For the most part, Telnet has been superseded by SSH, but it’s still used by some websites. Port 23 is a TCP protocol that connects users to remote computers. Hackers can exploit port 22 by using leaked SSH keys or brute-forcing credentials. It’s a TCP port for ensuring secure access to servers.
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