Lack of security is the only hurdle in wide adoption of cloud computing.
Cloud computing is surrounded by many security issues like securing data, and examining the utilization of cloud by the cloud computing vendors.
The wide acceptance www has raised security risks along with the uncountable benefits, so is the case with cloud computing.
The boom in cloud computing has brought lots of security challenges for the consumers and service providers. How the end users of cloud computing know that their information is not having any availability and security issues? Every one poses, Is their information secure? This study aims to identify the most vulnerable security threats in cloud computing, which will enable both end users and vendors to know about the key security threats associated with cloud computing. Our work will enable researchers and security professionals to know about users and vendors concerns and critical analysis about the different security models and tools proposed.