Now-a-days, cloud computing becomes a popular research subject. Almost all types of organizations adopting cloud computing technology. Organizations use the cloud as (SaaS, PaaS, and IaaS) and deployment models (private, public, hybrid, and community). As cloud services are more efficient to the service providers and clients but some issues in case of security Is important, which the authors have to take in to account. These types of issues may be faced by service providers as well as clients. In this paper, they will revise some cloud security threats.