Last week Microsoft released the updates KB2506143 and KB2506146 through Windows Update. Caution with installing these updates when using Configuration Manager 2012. After installing this update you could end up with broken clients and/or servers. The client health check on clients will show the following error in the console:
Installing this update on your SCCM Site Server environment can possibly broke your Management Points. If you have installed these updates on clients you can remove the update and reinstall the ConfigMgr client. Normally the problems must then be solved. If this is not the case and you have problems you can log a support case at Microsoft. Normally these cases should’t be charged.
More information can be found on one of these links: