After a quiet January Patch Tuesday that saw only one security update, Microsoft is back with a vengeance this month.

Microsoft has shot down reports that its Internet Information Services (IIS) suffers from a vulnerability, saying that customers only need to worry if they are running a nondefault configuration of the web server.

Microsoft delivered its monthly security update on Tuesday to rectify 12 vulnerabilities, five of which are present in Internet Explorer (IE) and comprise the most pressing patch to deploy.