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 Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Exchange | ||
| Microsoft Exchange Server 2016 | =19 | |
| Microsoft Exchange Server 2013 | =23 | |
| Microsoft Exchange Server 2019 | =8 | |
| Microsoft Exchange Server 2019 | =9 | |
| Microsoft Exchange Server 2016 | =20 | |
| 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 |
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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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