Internet TCP port 443 is commonly used by web browsers for HTTPS (Hypertext Transfer Protocol Secure) traffic, ensuring secure communication over the web. It is also used by various other software applications that require secure data transfer, such as VPNs (Virtual Private Networks) like OpenVPN. Additionally, email clients like Microsoft Outlook use port 443 for secure email retrieval via SSL/TLS. Video conferencing tools like Zoom also use this port for encrypted communication.
TCP port 443 is typically used for HTTPS traffic and is a common target for hackers due to its widespread use. In the past, hackers have exploited this port using Man-in-the-Middle (MitM) attacks, where they intercept and potentially alter the communication between two parties without their knowledge. Another common exploit is the SSL/TLS Renegotiation Vulnerability, which allows an attacker to inject plaintext into the victim's requests. Port 443 has also been used for Command and Control (C2) communication by malware after a system has been compromised. Additionally, hackers have been known to use port 443 for tunneling malicious traffic, as it is often left open to allow secure web browsing.
