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CVE-2021-26855CISA KEV

Microsoft Exchange Server Remote Code Execution Vulnerability

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEV Check MSRC

CISA catalog record

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Product
Exchange Server
Added to KEV
3 Nov 2021
Federal remediation due
3 May 2022
Known ransomware use
Yes
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