Spoofing Vulnerability in Microsoft Exchange Server by Microsoft
CVE-2025-64667

5.3MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Exchange Server Subscription Edition Rtm
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft Exchange Server 2019 Cumulative Update 14
Vendor
CVE Published:
9 December 2025

What is CVE-2025-64667?

A user interface misrepresentation vulnerability in Microsoft Exchange Server permits an unauthorized attacker to deceive users, enabling malicious spoofing activities across the network. This flaw can compromise the integrity of system communications and allow attackers to impersonate legitimate users or services, potentially leading to unauthorized data access or manipulation.

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Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems 15.01.0.0 < 15.01.2507.063

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems 15.02.0.0 < 15.02.1544.037

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems 15.02.0.0 < 15.02.1748.042

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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