CVE-2021-38634: Microsoft Windows Update Agent Directory Junction Privilege Escalation Vulnerability
First published: Tue Sep 14 2021(Updated: )
Microsoft Windows Update Client Elevation of Privilege Vulnerability
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows Server | =20H2 | |
| Microsoft Windows Server | =2004 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server 2022 | ||
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =20H2 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1809 | |
| Windows 10 | =1607 | |
| Windows 10 | =1607 | |
| Windows 10 | =21H1 | |
| Windows 10 | =21H1 | |
| Windows 10 | =21H1 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | =1909 | |
| Windows 10 | ||
| Windows 10 | ||
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | =2004 | |
| Windows 10 | ||
| Windows 10 | =20h2 | |
| Windows 10 | =21h1 | |
| Windows 10 | =1607 | |
| Windows 10 | =1809 | |
| Windows 10 | =1909 | |
| Windows 10 | =2004 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Operating System |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-38634?
The severity of CVE-2021-38634 is rated as important, allowing local attackers to escalate privileges.
How do I fix CVE-2021-38634?
To fix CVE-2021-38634, apply the latest security updates provided by Microsoft for affected Windows versions.
Which Windows versions are affected by CVE-2021-38634?
CVE-2021-38634 affects various versions of Windows 10 and Windows Server, specifically those noted to be on version 20H2, 21H1, 1607, 1809, 1909, and 2004.
Can CVE-2021-38634 be exploited remotely?
CVE-2021-38634 cannot be exploited remotely as it requires local access to the system.
What type of vulnerability is CVE-2021-38634?
CVE-2021-38634 is classified as an Elevation of Privilege vulnerability within the Microsoft Windows Update Client.
- agent/type
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- collector/msrc-cve
- source/Microsoft
- agent/weakness
- agent/software-canonical-lookup
- agent/title
- agent/remedy
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- agent/severity
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- collector/mitre-cve
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- alias/ZDI-21-1075
- alias/ZDI-CAN-13765
- alias/CVE-2021-38634
- vendor/microsoft
- canonical/microsoft windows server
- version/microsoft windows server/20h2
- version/microsoft windows server/2004
- canonical/microsoft windows server 2016
- canonical/microsoft windows server 2019
- canonical/microsoft windows server 2022
- canonical/windows 10
- version/windows 10/20h2
- version/windows 10/1809
- version/windows 10/1607
- version/windows 10/21h1
- version/windows 10/1909
- version/windows 10/2004
- version/microsoft windows server 2016/20h2
- version/microsoft windows server 2016/2004
- canonical/microsoft windows operating system