“By downloading and running this tool, which includes the latest Microsoft Safety Scanner, customers will automatically mitigate CVE-2021-26855 on any Exchange server on which it is deployed,” said Microsoft in its release notes. Tested across Exchange Server 2013, 20 deployments, Microsoft said the new tool was supposed to serve as an “interim mitigation” for users who may not necessarily be familiar with standard patch and update procedures, or who have not yet applied the updates, which dropped on 2 March. Redmond said it had been working actively with customers through its support teams, third-party hosting providers and its channel partner network to help them secure their environments and respond to threats resulting from attacks exploiting ProxyLogon – which began through a state-linked Chinese group known as Hafnium and have since spread far and wide to be exploited by many others, including ransomware gangs.īased on these engagements, Microsoft’s teams realised there was a clear need for a “simple, easy-to-use, automated” solution to meet the needs of customers using current and out-of-support versions on on-premise Exchange Server.
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