Cloud computing has gained significant traction for recent years. It is a form of distributed computing whereby resources and application platform are shared over the internet through on demand and pay on utilization basis. Several companies have already built Internet consumer services such as search engine, use of some websites to communicate with other user in websites, E-mail services, and services to purchase items online that use cloud computing infrastructure.However this technology suffers from threats and vulnerabilities that prevent the users from trusting it. The occurrence of these threats may result into damaging of confidential data in cloud environment. This survey paper aims to analyze the various unresolved security threats in cloud computing which are affecting the various stake-holders linked to it. It also describes the pros and cons of the existing security strategy and also introduces the existing issues in cloud computing such as data integrity, data segregation, and security and so on.