The emergence of vulnerability black markets enhances the opportunities for malicious actors to launch exploits toward computer networks, to commit cyber-crime and to perform other unlawful activities. Asymmetric information, inadequate software testing, lack of incentive to improve quality of the software are presumed to be the most important grounds of the software vulnerability problems. This work is a preliminary model to build a structure that may explain the factors influencing the emergence of vulnerability black market and to simulate undesired consequences from desired effect to eliminate software vulnerabilities. The purpose of the research is to provide better understanding for information security community about the dynamic features of the software vulnerability and the vulnerability black market problems.