摘要: Security vulnerabilities in servers and operating systems are software defects that represent great risks. Both developers users struggling to contain the risk posed by these vulnerabilities. The discovered both external testers throughout life-span of a system. A few models for vulnerability discovery process have just been published recently. Such will allow effective resource allocation patch development also needed evaluating exploitation. Here we examine process. examined analytically using actual data on three widely-used systems. applicability proposed significance parameters involved discussed. limitations major research challenges identified