Internet security researchers say they have identified software weaknesses that put millions of smart devices at risk for attacks, or hacking. The security weaknesses, also known as vulnerabilities, could be used by hackers to attack business or home computer networks. The report, by cybersecurity company Forescout Technologies, says the affected devices were built by an estimated 150 manufacturers. Many devices are designed for personal use and include the ability to control home cameras and temperature controls from a distance, the report said. Companies use similar devices in security systems, heating and cooling equipment, printers, and servers.