This Patch Tuesday (June, 13) Microsoft released many security bulletins, one of them was MS11-040. The bulletin discuss about a privately reported security vulnerability in Microsoft Forefront Threat Management Gateway (TMG) 2010 Client that could allow RCE (Remote Code Execution).
Also, in this week Microsoft released an update for Forefront TMG 2010 Service Pack 1 with Software Update 1. This is not a security update, but a Rollup 4 to correct some bugs found in HTTPS inspection, Malware inspection, E-mail Policy and TMG firewall engine.
Keep in mind that 4 of 11 bug fixes must activated running a script provided in their own KB page. In my opinion, this is great because you can choose if you want to enable the new functionality or not. For example, the KB2518663 has the following warning:
This resolution may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. Microsoft does not recommend this resolution but is providing this information so that you can choose to implement this resolution at your own discretion. Use this resolution at your own risk.
For more information about the Rollup 4, read KB2517957.