Context: Software industry is continuously exploring better ways to develop applications. A new phenomenon to achieve this is Cloud based Global Software Development (CGSD), which refers to the adoption of cloud computing services by organizations to support global software development projects. The CGSD approach affects the strategic and operational aspects of the way projects are managed. Objective: The objective of the study is to identify the success factors which contribute to management of CGSD projects. Methods: We carried out a Multivocal Literature Review (MLR) to identify the success factors from the state-of-the-art and the state-of-the-practice in project management of CGSD projects. We identified 32 success factors that contribute to the management of CGSD projects. Results: The findings of MLR indicate that time to market, continuous development, financial restructuring, scalability Moreover, the findings of the study show that there is a positive correlation between the success factors reported in both formal literature and industry based grey literature. Conclusion: The findings of this study can assist the practitioners to develop the strategies needed for effective project management of CGSD projects.