IoT is an abbreviation of the term Internet of Things. The term describes everyday items such as light bulbs that are connected to the Internet. IoT is a field that is growing very quickly with some researchers and industry leaders predicting that there will be up to 200 billion connected IoT devices in the world by 2020. Many IoT devices are developed by smaller companies looking to capitalize on a specific need in the market. Because of this, the companies may favor launching a product as fast as possible which could mean that the devices may have not been adequately tested for different vulnerabilities. The IoT and Smart Home market is currently experiencing rapid growth and all signs point towards that continuing in the future. This thesis focuses on testing for vulnerabilities to Denial of Service attacks in common-off-the-shelf IoT devices that can be found in a smart home environment. The purpose of this thesis is to create more knowledge about the vulnerabilities that can be found in Internet connected devices that are used daily. This thesis includes experiments using OpenVAS, which is a vulnerability scanner developed by Greenbone Security used to test for vulnerabilities to Denial of Service attacks in IoT devices. The devices that are tested are Sony PlayStation 4, IKEA Trådfri Smart Lighting, Google Chromecast (First Generation), Apple TV (Third Generation) and D-Link DCS-930LB Wi-Fi IP-Camera. The firmware/software of all the devices are updated as of April of 2019. The results of the conducted experiments show that all the tested devices besides Chromecast and IKEA Trådfri had vulnerabilities to Denial of Service attacks. PlayStation 4 was the device with the highest amount of vulnerabilities (9) and the vulnerability with highest possible severity (10.0). The effects of a Denial of Service attack range from an annoyance, when a gaming console is unavailable, to a security risk when an IP camera can be temporarily disabled.