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CVE-2025-64666

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVSS 7.5 HIGHEPSS 1.0%CWE-20
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23Microsoft · Microsoft Exchange Server 2019 Cumulative Update 14Microsoft · Microsoft Exchange Server 2019 Cumulative Update 15Microsoft · Microsoft Exchange Server Subscription Edition RTM

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References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666