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Fencer Intel
high 7.7

CVE-2021-40463 json

Windows Network Address Translation (NAT) Denial of Service Vulnerability

published 5y ago modified 4mo ago also EUVD-2021-27640

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Windows Network Address Translation (NAT) Denial of Service Vulnerability

Patch / fix

  • Microsoft Windows 10 Version 1809 10.0.17763.2237
  • Microsoft Windows Server 2019 10.0.17763.2237
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2237
  • Microsoft Windows 10 Version 1909 10.0.18363.1854
  • Microsoft Windows 10 Version 21H1 10.0.19043.1288
  • Microsoft Windows Server 2022 10.0.20348.288
  • Microsoft Windows 10 Version 2004 10.0.19041.1288
  • Microsoft Windows Server version 2004 10.0.19041.1288
  • Microsoft Windows 10 Version 20H2 10.0.19042.1288
  • Microsoft Windows Server version 20H2 10.0.19042.1288
  • Microsoft Windows 11 version 21H2 10.0.22000.258
  • Microsoft Windows 10 Version 1507 10.0.10240.19086
  • Microsoft Windows 10 Version 1607 10.0.14393.4704
  • Microsoft Windows Server 2016 10.0.14393.4704
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4704
  • Microsoft Windows 8.1 6.3.9600.20144
  • Microsoft Windows Server 2012 6.2.9200.23490
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.23490
  • Microsoft Windows Server 2012 R2 6.3.9600.20144
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20144

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Exploit prediction

2.58% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows 10 Version 1909
  • Microsoft Windows 10 Version 21H1
  • Microsoft Windows Server 2022
  • Microsoft Windows 10 Version 2004
  • Microsoft Windows Server version 2004
  • Microsoft Windows 10 Version 20H2
  • Microsoft Windows Server version 20H2
  • Microsoft Windows 11 version 21H2
  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)

References

Sources

Fencer Intel 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.