What has been the most important type of vulnerability in the last 25 years? What percentage of total vulnerabilities did this represent? Which browser truly had the most critical vulnerabilities? In this research, Yves Younan, senior research engineer with Sourcefire’s Vulnerability Research Team (VRT), answers these questions and more based on his analysis of the last 25 Years of Vulnerabilities: 1988-2012. Younan analyzed data available from the Common Vulnerabilities and Exposures (CVE) database, an international standard for vulnerability numbering or identification, as well as the National Vulnerability Database (NVD) National Institute of Standards and Technology (NIST), for this report.