CVE-2021-26858

Microsoft Defender Antivirus and System Center Endpoint Protection will automatically mitigate CVE-2021-26855 on any vulnerable Exchange Server on which it is deployed. We have taken this additional step to further support our customers who are still vulnerable and have not yet implemented the complete security update.

The post Automatic on-premises Exchange Server mitigation now in Microsoft Defender Antivirus appeared first on Microsoft Security.

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Microsoft Corp. today released software updates to plug four critical security holes that attackers have been using to plunder email communications at companies that use its Exchange Server products. The company says all four flaws are being actively exploited as part of a complex attack chain deployed by a previously unidentified Chinese cyber espionage group.

Read More Microsoft: Chinese Cyberspies Used 4 Exchange Server Flaws to Plunder Emails