CVE-2025-64667

Microsoft Exchange Server Spoofing Vulnerability

CVE-2025-64667 is fixed in 4 products on 1 platform, first by KB5071873, released December 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.3

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0080

56th percentile

<p>User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5071873	Dec 9, 2025
Microsoft Exchange Server 2019 Cumulative Update 14	KB5071874	Dec 9, 2025
Microsoft Exchange Server 2019 Cumulative Update 15	KB5071875	Dec 9, 2025
Microsoft Exchange Server Subscription Edition RTM	KB5071876	Dec 9, 2025

Details

Published
December 9, 2025
Weakness
User Interface (UI) Misrepresentation of Critical Information
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64667

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