MSRC-CVE-2025-25007 — Microsoft Exchange Server Spoofing Vulnerability

Summary

Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metrics, successful exploitation of this vulnerability could lead to no loss of confidentiality (C:N) and integrity (I:N), but could lead to some loss of availability (A:L). What does that mean for this vulnerability?
An attacker could spoof incorrect 5322.From email address that is displayed to a user.

Security updates
15.02.2562.020 — https://support.microsoft.com/help/5063224
15.01.2507.058 — https://support.microsoft.com/help/5063223
15.02.1544.033 — https://support.microsoft.com/help/5063222
15.02.1748.036 — https://support.microsoft.com/help/5063221

Vulnerabilities 1

Medium 5.3

CVE-2025-25007

Microsoft Exchange Server Spoofing Vulnerability

Improper validation of syntactic correctness of input in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server Subscription Edition RTM Microsoft Exchange Server 2019 Cumulative Update 14

Aug 12, 2025

Revision history

2025-08-12 #1
Information published.

References

CVE-2025-25007 Microsoft Exchange Server Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-25007
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss