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High severity8.1NVD Advisory· Published Jan 10, 2023· Updated Jun 17, 2026

CVE-2023-21556

CVE-2023-21556

Description

Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability

Affected products

57
  • Microsoft/Windows 10 160715 versions
    cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*+ 14 more
    • cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*
    • cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:x86:*
    • cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*
    • cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*
    • (no CPE)range: 10.0.14393.0
    • (no CPE)range: 10.0.0
    • (no CPE)range: 10.0.19043.0
    • (no CPE)range: 10.0.19045.0
  • Microsoft/Windows 10 18094 versions
    cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*+ 3 more
    • cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*
    • (no CPE)range: 10.0.0
  • Microsoft/Windows 11 21h23 versions
    cpe:2.3:o:microsoft:windows_11_21h2:-:*:*:*:*:*:arm64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_11_21h2:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_11_21h2:-:*:*:*:*:*:x64:*
    • (no CPE)range: 10.0.0
  • Microsoft/Windows 11 23h23 versions
    cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:arm64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:arm64:*
    • cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:x64:*
    • (no CPE)range: 10.0.22621.0
  • Microsoft/Windows 73 versions
    cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x86:*
    • (no CPE)range: 6.1.0
  • Microsoft/Windows 8.13 versions
    cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x86:*
    • (no CPE)range: 6.3.0
  • Microsoft/Windows Rt 8.1
    cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
  • Microsoft/Windows Server 20086 versions
    cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*+ 5 more
    • cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
    • cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
    • cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
    • (no CPE)range: 6.0.6003.0
    • (no CPE)range: 6.1.7601.0
    • (no CPE)range: 6.0.6003.0
  • Microsoft/Windows Server 20124 versions
    cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*+ 3 more
    • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
    • (no CPE)range: 6.2.9200.0
    • (no CPE)range: 6.3.9600.0
  • Microsoft/Windows Server 20162 versions
    cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
    • (no CPE)range: 10.0.14393.0
  • Microsoft/Windows Server 20192 versions
    cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
    • (no CPE)range: 10.0.17763.0
  • Microsoft/Windows Server 20032 versions
    cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
    • (no CPE)range: 10.0.20348.0
  • Microsoft/Layer 2 Tunneling Protocolllm-fuzzy
  • Microsoft/Windows 10 1909cpe-rescue
    Range: 10.0.10240.0
  • Microsoft/Windows CSC Servicecpe-rescue
    Range: 6.1.0
  • Microsoft/Windows Server 2008 R2 Service Pack 1 (Server Core installation)v5
    Range: 6.1.7601.0
  • Microsoft/Windows Server 2008 Service Pack 2 (Server Core installation)v5
    Range: 6.0.6003.0
  • Microsoft/Windows Server 2012 (Server Core installation)v5
    Range: 6.2.9200.0
  • Microsoft/Windows Server 2012 R2 (Server Core installation)v5
    Range: 6.3.9600.0
  • Microsoft/Windows Server 2016 (Server Core installation)v5
    Range: 10.0.14393.0
  • Microsoft/Windows Server 2019 (Server Core installation)v5
    Range: 10.0.17763.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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