Exploited
high
7.5
CWE
287
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-33766: Microsoft Exchange Server ECP Authentication Bypass Information Disclosure Vulnerability

First published: Tue Jul 13 2021(Updated: )

Microsoft Exchange Information Disclosure Vulnerability

Credit: secure@microsoft.com secure@microsoft.com secure@microsoft.com

Affected SoftwareAffected VersionHow to fix
Microsoft Exchange
Microsoft Exchange Server 2016=19
fix available externally
Microsoft Exchange Server 2013=23
fix available externally
Microsoft Exchange Server 2019=8
fix available externally
Microsoft Exchange Server 2019=9
fix available externally
Microsoft Exchange Server 2016=20
fix available externally
Microsoft Exchange Server=2013-cumulative_update_23
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2016-cumulative_update_20
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2019-cumulative_update_9
Microsoft Exchange Server
=2013-cumulative_update_23
=2016-cumulative_update_19
=2016-cumulative_update_20
=2019-cumulative_update_8
=2019-cumulative_update_9

Remedy

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-33766?

    CVE-2021-33766 is a vulnerability that allows remote attackers to disclose sensitive information on affected installations of Microsoft Exchange Server.

  • How severe is CVE-2021-33766?

    CVE-2021-33766 has a severity rating of 7.5, which is considered high.

  • What software is affected by CVE-2021-33766?

    Microsoft Exchange Server 2013, 2016, and 2019 are affected by CVE-2021-33766.

  • Do I need authentication to exploit CVE-2021-33766?

    No, authentication is not required to exploit CVE-2021-33766.

  • How can I fix CVE-2021-33766?

    To fix CVE-2021-33766, apply the relevant patches provided by Microsoft or follow the recommended remediation steps available on their support website.

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