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Microsoft confirms zero-day exploits against Exchange Server in limited attacks

Microsoft is developing a patch for two actively exploited zero-day vulnerabilities in Microsoft Exchange Server. The flaws, tracked as CVE-2022-41040 and CVE-2022-41082, were discovered in Microsoft’s enterprise mail server by Vietnamese cybersecurity firm GTSC. Microsoft said it is aware of “a small number of targeted attacks” exploiting the flaws, which impact on-prem Microsoft Exchange Server versions 2013, 2016, and 2019. The bugs appear to be less dangerous variants – on account of authentication to PowerShell being required – of the critical ProxyShell vulnerabilities that were widely abused in 2021.