cve 2025 64667

CVE-2025-64667 is a medium-severity spoofing and UI misrepresentation vulnerability in Microsoft Exchange Server, assigned by Microsoft and published on December 9, 2025. With a CVSS 3.1 score of approximately 5.3, it affects on-premises and hybrid Exchange deployments. The vulnerability allows an attacker to manipulate the user interface, potentially tricking users into granting unintended permissions or performing actions that compromise security. Mitigation involves applying the official patch from Microsoft and hardening Exchange configurations. Administrators should prioritize monitoring and remediation to reduce exposure. This tag covers discussions on the vulnerability details, patch deployment, and security best practices for Exchange environments.