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Microsoft Security Servicing Criteria for Windows
One of our goals in the Microsoft Security Response Center (MSRC) is to be more transparent with security researchers and our customers on the criteria we use for determining when we intend to address a reported vulnerability through a security update. Our belief is that improving transparency on this topic helps provide clarity on how we assess risk, sets expectations for the types of vulnerabilities that we intend to service, and facilitates constructive dialogue as the threat landscape evolves over time.