Microsoft's first Patch Tuesday of 2013 fixes two critical vulnerabilities and five important vulnerabilities.
The first critical vulnerability, MS13-001, is a flaw in the Windows 7/Windows Server 2008 R2 print spooler service that if exploited could lead to remote code execution.
MS13-002 is the other critical flaw and affects Microsoft XML Core Services. This vulnerability also could lead to remote code execution if someone using Internet Explorer is enticed to surf to a malicious web page. This affects all currently released versions of Windows, including RT.