CVE-2021-26889: Microsoft Windows Setup Directory Junction Privilege Escalation Vulnerability
First published: Tue Mar 09 2021(Updated: )
Windows Update Stack Elevation of Privilege Vulnerability
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows Server | =2004 | |
| Microsoft Windows Server | =1909 | |
| Microsoft Windows Server | =20H2 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2019 | ||
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =1803 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | =1803 | |
| Windows 10 | =1803 | |
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | =20h2 | |
| Windows 10 | =1803 | |
| Windows 10 | =1809 | |
| Windows 10 | =1909 | |
| Windows 10 | =2004 | |
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =1909 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Operating System |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-26889?
CVE-2021-26889 is classified as a critical privilege escalation vulnerability.
How can I fix CVE-2021-26889?
To fix CVE-2021-26889, you should apply the latest security updates provided by Microsoft.
What versions of Windows are affected by CVE-2021-26889?
CVE-2021-26889 affects various versions of Windows 10 and Windows Server, specifically version 20H2 and others identified in the advisory.
Can CVE-2021-26889 be exploited remotely?
CVE-2021-26889 requires local access for exploitation, making it less likely to be executed remotely.
What should I do if I cannot apply the patch for CVE-2021-26889 immediately?
If immediate patching is not possible, limit local access to affected systems as a temporary mitigation for CVE-2021-26889.
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- alias/CVE-2021-26889
- vendor/microsoft
- canonical/microsoft windows server
- version/microsoft windows server/2004
- version/microsoft windows server/1909
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- canonical/microsoft windows server 2019
- canonical/windows 10
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- version/windows 10/1803
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- version/windows 10/2004
- canonical/microsoft windows server 2016
- version/microsoft windows server 2016/20h2
- version/microsoft windows server 2016/1909
- version/microsoft windows server 2016/2004
- canonical/microsoft windows operating system