CVE-2021-26858: Microsoft Exchange Server Remote Code Execution Vulnerability
First published: Tue Mar 02 2021(Updated: )
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
Credit: secure@microsoft.com secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Exchange Server | =2013-cumulative_update_23 | |
| Microsoft Exchange Server | =2016-cumulative_update_18 | |
| Microsoft Exchange Server | =2016-cumulative_update_19 | |
| Microsoft Exchange Server | =2019-cumulative_update_7 | |
| Microsoft Exchange Server | =2019-cumulative_update_8 | |
| Microsoft Exchange Server | =2010-sp3 | |
| Microsoft Exchange Server | =2013-cumulative_update_22 | |
| Microsoft Exchange Server | =2013-sp1 | |
| Microsoft Exchange Server | =2016-cumulative_update_10 | |
| Microsoft Exchange Server | =2016-cumulative_update_11 | |
| Microsoft Exchange Server | =2016-cumulative_update_12 | |
| Microsoft Exchange Server | =2016-cumulative_update_13 | |
| Microsoft Exchange Server | =2016-cumulative_update_14 | |
| Microsoft Exchange Server | =2016-cumulative_update_15 | |
| Microsoft Exchange Server | =2016-cumulative_update_16 | |
| Microsoft Exchange Server | =2016-cumulative_update_17 | |
| Microsoft Exchange Server | =2016-cumulative_update_8 | |
| Microsoft Exchange Server | =2016-cumulative_update_9 | |
| Microsoft Exchange Server | =2019 | |
| Microsoft Exchange Server | =2019-cumulative_update_1 | |
| Microsoft Exchange Server | =2019-cumulative_update_2 | |
| Microsoft Exchange Server | =2019-cumulative_update_3 | |
| Microsoft Exchange Server | =2019-cumulative_update_4 | |
| Microsoft Exchange Server | =2019-cumulative_update_5 | |
| Microsoft Exchange Server | =2019-cumulative_update_6 | |
| Microsoft Exchange Server | ||
| =2010-sp3 | ||
| =2013-cumulative_update_22 | ||
| =2013-cumulative_update_23 | ||
| =2013-sp1 | ||
| =2016-cumulative_update_10 | ||
| =2016-cumulative_update_11 | ||
| =2016-cumulative_update_12 | ||
| =2016-cumulative_update_13 | ||
| =2016-cumulative_update_14 | ||
| =2016-cumulative_update_15 | ||
| =2016-cumulative_update_16 | ||
| =2016-cumulative_update_17 | ||
| =2016-cumulative_update_18 | ||
| =2016-cumulative_update_19 | ||
| =2016-cumulative_update_8 | ||
| =2016-cumulative_update_9 | ||
| =2019 | ||
| =2019-cumulative_update_1 | ||
| =2019-cumulative_update_2 | ||
| =2019-cumulative_update_3 | ||
| =2019-cumulative_update_4 | ||
| =2019-cumulative_update_5 | ||
| =2019-cumulative_update_6 | ||
| =2019-cumulative_update_7 | ||
| =2019-cumulative_update_8 |
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Reference Links
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858
- https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities)
- https://nvd.nist.gov/vuln/detail/CVE-2021-26858
- https://www.bleepingcomputer.com/news/security/atandt-verizon-reportedly-hacked-to-target-us-govt-wiretapping-platform/
Frequently Asked Questions
What is CVE-2021-26858?
CVE-2021-26858 is the identifier for the Microsoft Exchange Server Remote Code Execution Vulnerability.
What is the severity of CVE-2021-26858?
The severity of CVE-2021-26858 is critical.
How does CVE-2021-26858 impact Microsoft Exchange Server?
CVE-2021-26858 allows for remote code execution in Microsoft Exchange Server.
How can I protect my Microsoft Exchange Server from CVE-2021-26858?
To protect your Microsoft Exchange Server from CVE-2021-26858, apply the security updates provided by Microsoft.
Where can I find more information about CVE-2021-26858?
You can find more information about CVE-2021-26858 at the following link: [https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858)
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- version/microsoft exchange server/2016-cumulative_update_10
- version/microsoft exchange server/2016-cumulative_update_11
- version/microsoft exchange server/2016-cumulative_update_12
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- version/microsoft exchange server/2016-cumulative_update_14
- version/microsoft exchange server/2016-cumulative_update_15
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