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Fencer Vulns
high 8.1

CVE-2023-21679 json

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

published 2023-01-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-25846

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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

Patch / fix

  • Microsoft Windows 10 Version 1809 10.0.17763.3887
  • Microsoft Windows Server 2019 10.0.17763.3887
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.3887
  • Microsoft Windows Server 2022 10.0.20348.1487
  • Microsoft Windows 10 Version 20H2 10.0.19042.2486
  • Microsoft Windows 11 version 21H2 10.0.22000.1455
  • Microsoft Windows 10 Version 21H2 10.0.19044.2486
  • Microsoft Windows 11 version 22H2 10.0.22621.1105
  • Microsoft Windows 10 Version 22H2 10.0.19045.2486
  • Microsoft Windows 10 Version 1507 10.0.10240.19685
  • Microsoft Windows 10 Version 1607 10.0.14393.5648
  • Microsoft Windows Server 2016 10.0.14393.5648
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.5648
  • Microsoft Windows 7 6.1.7601.26321
  • Microsoft Windows 7 Service Pack 1 6.1.7601.26321
  • Microsoft Windows 8.1 6.3.9600.20778
  • Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21872
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.21872
  • Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21872
  • Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26321
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.26321
  • Microsoft Windows Server 2012 6.2.9200.24075
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.24075
  • Microsoft Windows Server 2012 R2 6.3.9600.20778
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20778

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 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
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows 10 Version 20H2
  • Microsoft Windows 11 version 21H2
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows 7
  • Microsoft Windows 7 Service Pack 1
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
  • Microsoft Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2008 R2 Service Pack 1
  • Microsoft Windows Server 2008 R2 Service Pack 1 (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)

Classification

Weakness
  • CWE-416 Use After Free
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.