CVE-2025-64666

No fix known EPSS 1%CVSS 7.5

Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Published 2025-12-09 · CVE record · OSV

Products: Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM