Secunia is an international IT security company specialising in vulnerability management based in Copenhagen, Denmark.
Based in Copenhagen, it is known in the industry for its work on zero-day attack vulnerabilities and the creation of patch systems that encompass several software vendors.
Numbers of "unpatched" vulnerabilities in popular applications are frequently quoted in software comparisons. Secunia has gained publicity and a notable reputation with the discovery of major zero day attack vulnerabilities in Internet Explorer and other widely used programs.