Annual Flexera Vulnerability Review Shows 81 Percent of All Vulnerabilities Had Available Patches, Yet Common Software Programmes Remain Unpatched. In 2016, a total of 17,147 vulnerabilities in 2,136 products from 246 vendors. 22 zero-day vulnerabilities were discovered in total in 2016, down from 22 in 2015. The split between vulnerabilities in Microsoft and non-Microsoft products in the 50 most popular applications on private PCs is at 22.5 percent and 77.5%.”]