Shodan is a Web based search engine that discovers Internet facing computers, including desktops, servers and routers. Shodan allows users to filter searches for systems running a specific type of application (say, Apache Web servers or FTP) and filter results by geographic region. The warning came in the form of an ICS-CERT Alert, published on October 28. Vulnerable devices range from a stand alone workstation to larger wide area network configurations connecting remote facilities to central monitoring systems
Source: https://threatpost.com/search-engine-finds-vulnerable-scada-systems-110210/74631/