CVE-2023-21556: Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
First published: Tue Jan 10 2023(Updated: )
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows 8.1 for x64-based systems | ||
| Microsoft Windows 7 | ||
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows 8.1 for 32-bit systems | ||
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 10 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows 7 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 10 | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows 10 Version 1607 x86 | ||
| Microsoft Windows 10 Version 1607 x86 | ||
| Microsoft Windows 10 1809 | ||
| Microsoft Windows 10 1809 | ||
| Microsoft Windows 10 1809 | ||
| Microsoft Windows 10 20H2 | ||
| Microsoft Windows 10 20H2 | ||
| Microsoft Windows 10 20H2 | ||
| Microsoft Windows 10 21h2 | ||
| Microsoft Windows 10 21h2 | ||
| Microsoft Windows 10 21h2 | ||
| Microsoft Windows 10 22h2 | ||
| Microsoft Windows 10 22h2 | ||
| Microsoft Windows 10 22h2 | ||
| Microsoft Windows 11 21h2 | ||
| Microsoft Windows 11 21h2 | ||
| Microsoft Windows 11 22h2 | ||
| Microsoft Windows 11 22h2 | ||
| Microsoft Windows 7 | =sp1 | |
| Microsoft Windows 7 | =sp1 | |
| Microsoft Windows 8.1 | ||
| Microsoft Windows 8.1 | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server 2008 Itanium | =sp2 | |
| Microsoft Windows Server 2008 Itanium | =sp2 | |
| Microsoft Windows Server 2008 Itanium | =r2-sp1 | |
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2012 x64 | =r2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows Server 2008 Itanium |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of CVE-2023-21556?
CVE-2023-21556 has been classified as a critical vulnerability due to its potential for remote code execution.
How do I fix CVE-2023-21556?
To fix CVE-2023-21556, apply the latest security patches provided by Microsoft for the affected Windows versions.
Which versions of Windows are affected by CVE-2023-21556?
CVE-2023-21556 affects multiple versions of Windows 10, Windows 11, and various Windows Server editions.
What type of vulnerability is CVE-2023-21556?
CVE-2023-21556 is classified as a remote code execution vulnerability impacting the Windows Layer 2 Tunneling Protocol (L2TP).
Is there a workaround for CVE-2023-21556?
While it is strongly recommended to apply patches, keeping systems updated and minimizing exposure to untrusted networks can serve as temporary mitigations.
- collector/msrc-cve
- agent/type
- agent/first-publish-date
- agent/title
- agent/severity
- agent/references
- agent/description
- source/Microsoft
- agent/software-canonical-lookup
- agent/weakness
- agent/author
- agent/event
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/source
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- collector/nvd-api
- source/NVD
- vendor/microsoft
- canonical/microsoft windows 10
- version/microsoft windows 10/20h2
- version/microsoft windows 10/22h2
- canonical/microsoft windows server 2016
- canonical/microsoft windows server 2012 r2
- canonical/microsoft windows 8.1 for x64-based systems
- canonical/microsoft windows 7
- version/microsoft windows 10/1607
- version/microsoft windows 10/21h2
- canonical/microsoft windows server 2008 r2
- canonical/microsoft windows 8.1 for 32-bit systems
- version/microsoft windows 10/1809
- canonical/microsoft windows 11
- version/microsoft windows 11/21h2
- version/microsoft windows 11/22h2
- canonical/microsoft windows server 2022
- canonical/microsoft windows server 2019
- canonical/microsoft windows server 2012 x64
- canonical/microsoft windows rt
- canonical/microsoft windows server 2008 itanium
- canonical/microsoft windows 10 version 1607 x86
- canonical/microsoft windows 10 1809
- canonical/microsoft windows 10 20h2
- canonical/microsoft windows 10 21h2
- canonical/microsoft windows 10 22h2
- canonical/microsoft windows 11 21h2
- canonical/microsoft windows 11 22h2
- version/microsoft windows 7/sp1
- canonical/microsoft windows 8.1
- version/microsoft windows server 2008 itanium/sp2
- version/microsoft windows server 2008 itanium/r2-sp1
- version/microsoft windows server 2012 x64/r2