This work scrutinizes the threat landscape that exist in next generation SGs. The main point to focus is that there is a huge number of attack vectors against a next generation SG due to its architectural components and its distributed functionality. By summarizing the majority of threats, proper security guidelines would be possible to be set up in order to protect modern applications on top of SGs. Future reaserch should focus on analysing the majority of these attacks in depth for the purpose of formulating ideal security measures that will mitigate this landscape