Why Most AWS Tutorials Get SSH Security Wrong—and How to Fix It

Most AWS tutorials dangerously leave SSH open to the entire internet (0.0.0.0/0), creating a critical security vulnerability that attackers routinely exploit. This hands-on implementation demonstrates the Least Privilege principle by restricting SSH access to a single IP using CIDR /32 notation—a foundational security practice many organizations overlook. Understanding this distinction between open-to-the-world and single-IP access is essential for anyone managing cloud infrastructure, as it dramatically reduces the attack surface without sacrificing usability.