Microsoft has published five updates for critical vulnerabilities in its operating systems / applications, as well as five important and one moderate updates in its software advisories.Critical updates in the sense of Microsoft is of important and significant and a must update in order to protect yours system running Microsoft softwares and appliances.You can get more ,detailed information from here.From this page you can search for the links of Microsoft's Security Bulletins MS10-019 - MS10-029 in order to have detailed observation.
In short the critical update addresses these issues . One privately reported vulnerability in Windows Media Player,Microsoft MPEG Layer-3 audio codec,Windows Media Services,two privately reported vulnerabilities in Windows Authenticode Verification,One publicly disclosed and several privately reported vulnerabilities in SMB Client.
If you have yours automatic updates enabled then it will download these critical security vulnerabilities for you or you can go Microsoft windows update site in order to manually patch yours OS.
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