MSRC-CVE-2021-33766 — 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 Personally Identifiable Information (PII).

Security updates
15.02.0858.010 — https://support.microsoft.com/help/5001779

Vulnerabilities 1

High 7.3

CVE-2021-33766 Exploited Public exploit Scanner template EPSS 98%

Microsoft Exchange Server Information Disclosure Vulnerability

Microsoft Exchange Server Information Disclosure Vulnerability

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8

Jul 14, 2021
KEV Jan 18, 2022

Revision history

2021-07-13 #1
Information published. This CVE was addressed by updates that were released in April 2021, but the CVE was inadvertently omitted from the April 2021 Security Updates. This is an informational change only. Customers who have already installed the April 2021 update do not need to take any further action.

References

CVE-2021-33766 Microsoft Exchange Server Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766
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