Vulnerability Database

309,961

Total vulnerabilities in the database

CVE-2021-40463

Windows Network Address Translation (NAT) Denial of Service Vulnerability

Published: Oct 13, 2021
Updated: Nov 16, 2025
CVE: CVE-2021-40463
Severity: High
Exploit:

CVSS v3:

Severity: High
Score: 7.7
AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS v2:

Severity: Low
Score: 4
AV:N/AC:L/Au:S/C:N/I:N/A:P

No CWE or OWASP classifications available.

Affected Software
References

Software	From	Fixed in
microsoft / windows_10	1607	1607.x
microsoft / windows_10	1809	1809.x
microsoft / windows_10	1909	1909.x
microsoft / windows_server_2016	2004	2004.x
microsoft / windows_10	2004	2004.x
microsoft / windows_server_2016	20h2	20h2.x
microsoft / windows_10	20h2	20h2.x
microsoft / windows_10	21h1	21h1.x
microsoft / windows_server_2012	--r2	--r2.x
microsoft / windows_server_2022	-	-
microsoft / windows_11_21h2	-	-

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40463

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