CVE-2023-21556
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
CVE-2023-21556 is a high vulnerability (CVSS 8.1) in Microsoft Windows 10 Version 1507, published January 10, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.42%, the 73rd percentile. No source names a fixed version.
- Severity
- 8.1 HighCVSS 3.1, CVE List
- Exploit chance
- 1.42%EPSS, 73rd percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
- microsoft windows 10 version 1507
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 20h2
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 21h2
- microsoft windows 11 version 22h2
- microsoft windows 7
- microsoft windows 7 service pack 1
- microsoft windows 8.1
- microsoft windows server 2008 service pack 2
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- microsoft windows server 2008 r2 service pack 1
- microsoft windows server 2008 r2 service pack 1 (server core installation)
- microsoft windows server 2008 service pack 2
- microsoft windows server 2008 service pack 2 (server core installation)
- microsoft windows server 2012
- microsoft windows server 2012 (server core installation)
- microsoft windows server 2012 r2
- microsoft windows server 2012 r2 (server core installation)
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows 10 1607
- microsoft windows 10 1809
- microsoft windows 10 20h2
- microsoft windows 10 21h2
- microsoft windows 10 22h2
- microsoft windows 11 21h2
- microsoft windows 11 22h2
- microsoft windows rt 8.1
- microsoft windows server 2008
What each source reports
CVE List Score used
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
- Record
CVE-2023-21556- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-191
- Updated
- 2026-11-02
EUVDEUVD-2023-25723
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
- Record
EUVD-2023-25723- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f98r-hf6q-m8m3
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability. This CVE ID is...
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2023-21543, CVE-2023-21546, CVE-2023-21555, CVE-2023-21679.
- Record
GHSA-f98r-hf6q-m8m3- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
- Record
CVE-2023-21556- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.