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Umbrella & DNS - Forefront Attack

Greetings, Just yesterday my NSM began alerting on hundreds of attacks (FOREFRONT: Microsoft Forefront Threat Management Gateway Client Remote Code Execution Vulnerability). The traffic is outbound from our internal domain controllers/DNS to OpenDNS (Umbrella). Has anyone seen this before or have any information on why this suddenly started occurring? There have been no obvious changes that I can relate this to.
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