Spoofing Vulnerability in Microsoft Exchange Server by Microsoft
CVE-2025-59248

7.5HIGH

Key Information:

Vendor

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

What is CVE-2025-59248?

An improper input validation issue in Microsoft Exchange Server can be exploited by malicious actors to conduct spoofing attacks over a network, potentially enabling unauthorized access and the impersonation of legitimate users.

Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems 15.01.0.0 < 15.01.2507.061

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems 15.02.0.0 < 15.02.1544.036

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems 15.02.0.0 < 15.02.1748.039

References

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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.
CVE-2025-59248 : Spoofing Vulnerability in Microsoft Exchange Server by Microsoft