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CVE-2023-21529CISA KEV

Microsoft Exchange Server Deserialization of Untrusted Data 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 a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.

Product
Exchange Server
Added to KEV
13 Apr 2026
Federal remediation due
27 Apr 2026
Known ransomware use
Yes
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