Microsoft issues emergency patches for 4 exploited 0-days in Exchange

Microsoft is urging customers to install emergency patches as soon as possible to protect against highly skilled hackers who are actively exploiting four zero-day vulnerabilities in Exchange Server.

The software maker said hackers working on behalf of the Chinese government have been using the previously unknown exploits to hack on-premises Exchange Server software that is fully patched. So far, Hafnium, as Microsoft is calling the hackers, is the only group it has seen exploiting the vulnerabilities, but the company said that could change.

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