What is the severity of CVE-2023-21757?

CVE-2023-21757 has been rated as Critical severity due to its potential to cause Denial of Service.

How do I fix CVE-2023-21757?

To fix CVE-2023-21757, apply the appropriate security updates and patches provided by Microsoft for affected Windows versions.

Which versions of Windows are affected by CVE-2023-21757?

CVE-2023-21757 affects various versions of Windows including Windows 10, Windows 11, and Windows Server from different release versions.

What impact does CVE-2023-21757 have on my system?

CVE-2023-21757 can allow an attacker to cause a Denial of Service, resulting in system downtime.

Is there a specific patch for CVE-2023-21757?

Yes, Microsoft has released several patches for CVE-2023-21757 which should be applied based on your specific Windows version.

Vulnerability/
CVE-2023-21757

high

7.5

CWE

476

10/1/2023

1/1/2025

CVE-2023-21757: Windows Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability

First published: Tue Jan 10 2023(Updated: )

Windows Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability

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

Affected Software	Affected Version	How to fix
Microsoft Windows Server 2012 R2		fix available externally fix available externally
Microsoft Windows Server 2008 R2		fix available externally fix available externally
Microsoft Windows 7		fix available externally fix available externally
Microsoft Windows 7		fix available externally fix available externally
Microsoft Windows Server 2012 R2		fix available externally fix available externally
Microsoft Windows Server 2008 R2		fix available externally fix available externally
Microsoft Windows RT		fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows Server		fix available externally fix available externally
Microsoft Windows 8.1		fix available externally fix available externally
Microsoft Windows 8.1		fix available externally fix available externally
Microsoft Windows Server 2019		fix available externally
Microsoft Windows Server 2019		fix available externally
Windows 11	=22H2	fix available externally
Windows 11	=22H2	fix available externally
Windows 11	=21H2	fix available externally
Windows 11	=21H2	fix available externally
Microsoft Windows Server 2022		fix available externally
Microsoft Windows Server 2022		fix available externally
Microsoft Windows Server 2016		fix available externally
Microsoft Windows Server 2016		fix available externally
Windows 10	=20H2	fix available externally
Windows 10	=20H2	fix available externally
Windows 10	=20H2	fix available externally
Windows 10	=1809	fix available externally
Windows 10	=1809	fix available externally
Windows 10	=1809	fix available externally
Windows 10	=22H2	fix available externally
Windows 10	=22H2	fix available externally
Windows 10	=22H2	fix available externally
Windows 10	=1607	fix available externally
Windows 10	=1607	fix available externally
Windows 10	=21H2	fix available externally
Windows 10	=21H2	fix available externally
Windows 10	=21H2	fix available externally
Windows 10		fix available externally
Windows 10		fix available externally
Windows 10
Windows 10	=20h2
Windows 10	=21h2
Windows 10	=22h2
Windows 10	=1607
Windows 10	=1809
Windows 11
Windows 11
Windows 11	=21h2
Windows 11	=21h2
Windows 11	=22h2
Windows 11	=22h2
Microsoft Windows 7	=sp1
Microsoft Windows
Microsoft Windows RT
Microsoft Windows Server	=sp2
Microsoft Windows Server	=r2-sp1
Microsoft Windows Server
Microsoft Windows Server	=r2
Microsoft Windows Server 2016
Microsoft Windows Server 2019
Microsoft Windows Server 2022

Never miss a vulnerability like this again

Reference Links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21757 (Advisory)

Frequently Asked Questions

What is the severity of CVE-2023-21757?
CVE-2023-21757 has been rated as Critical severity due to its potential to cause Denial of Service.
How do I fix CVE-2023-21757?
To fix CVE-2023-21757, apply the appropriate security updates and patches provided by Microsoft for affected Windows versions.
Which versions of Windows are affected by CVE-2023-21757?
CVE-2023-21757 affects various versions of Windows including Windows 10, Windows 11, and Windows Server from different release versions.
What impact does CVE-2023-21757 have on my system?
CVE-2023-21757 can allow an attacker to cause a Denial of Service, resulting in system downtime.
Is there a specific patch for CVE-2023-21757?
Yes, Microsoft has released several patches for CVE-2023-21757 which should be applied based on your specific Windows version.

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