Cloud is one of the promising technologies that has enabled the massive growth of Internet-based services, from search to streaming media to offline storage of individual data as well as the background processing capabilities that enable mobile Internet devices. Security is recognized as a prevalent function but unfortunately, security threats have become a major challenge in cloud. There are several hacking systems used by hackers in order to attack the cloud system. Here, this study reviews about the wireless hacking techniques that affect the security of cloud systems. In particular, this study reviews about four main hacking techniques such as account hijacking attack, denial of service (DoS) attack, wrapping attack and cloud malware injection attack. This study also concludes that, even though, there are numerous solutions available in practice to overcome these attacks, wireless hacking techniques are still upsetting the security of cloud systems at a greater extent.