Finally found a good Common Vulnerability and Exposures (CVE) database: http://www.cvedetails.com/. There are several (seemingly) similar databases that pretty much lists up all vulnerabilities that are included in CVE, but these guys takes it one step further with plenty of drill-down options and easy searches. Among its features, the site has graphs of types and occurrence frequencies of vulnerabilities, for example this one at the front page:
It is also possible to drill down further based on version numbers, type of application, manufacturer, etc. I tested it for OAS, and easily found cool data, among others you could list up all OAS vulnerabilities per year and per type:
I think I’m going to continue using this. Nice job!