MSRC-CVE-2025-33051 — Microsoft Exchange Server Information Disclosure Vulnerability

Summary

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

Details

What type of information could be disclosed by this vulnerability?
The type of information that could be disclosed if an attacker successfully exploited this vulnerability is whether an email address exists on the server or not.

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

Vulnerabilities 1

High 7.5

CVE-2025-33051

Microsoft Exchange Server Information Disclosure Vulnerability

Exposure of sensitive information to an unauthorized actor in Microsoft Exchange Server allows an unauthorized attacker to disclose information 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-2025-33051 Microsoft Exchange Server Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33051
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