CVE-2025-64666

high Microsoft
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.1%
Exploitation probability in 30 days
Top 79% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: December 9, 2025 (156 days ago)
Last Modified: January 2, 2026
Vendor: Microsoft

Description

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

CWE

CWE-20

Affected Products

microsoft exchange server

References

🔗 msrc.microsoft.com