CVE-2021-40463
Windows Network Address Translation (NAT) Denial of Service Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Windows Network Address Translation (NAT) Denial of Service Vulnerability
Timeline
ID reserved
By microsoft
- 41 days later
· 41 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High7.7 | 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 |
| NVDNVD · Modified | 3.1 | High7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 2.6% · top 15% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.
Weakness
- Denial of Service
Affected products
Microsoft · Windows 10 Version 1809
- affected 10.0.0 – < 10.0.17763.2237
Microsoft · Windows Server 2019
- affected 10.0.0 – < 10.0.17763.2237
Microsoft · Windows Server 2019 (Server Core installation)
- affected 10.0.0 – < 10.0.17763.2237
Microsoft · Windows 10 Version 1909
- affected 10.0.0 – < 10.0.18363.1854
Microsoft · Windows 10 Version 21H1
- affected 10.0.0 – < 10.0.19043.1288
Microsoft · Windows Server 2022
- affected 10.0.0 – < 10.0.20348.288
Microsoft · Windows 10 Version 2004
- affected 10.0.0 – < 10.0.19041.1288
Microsoft · Windows Server version 2004
- affected 10.0.0 – < 10.0.19041.1288
Microsoft · Windows 10 Version 20H2
- affected 10.0.0 – < 10.0.19042.1288
Microsoft · Windows Server version 20H2
- affected 10.0.0 – < 10.0.19042.1288
Microsoft · Windows 11 version 21H2
- affected 10.0.0 – < 10.0.22000.258
Microsoft · Windows 10 Version 1507
- affected 10.0.0 – < 10.0.10240.19086
Microsoft · Windows 10 Version 1607
- affected 10.0.0 – < 10.0.14393.4704
Microsoft · Windows Server 2016
- affected 10.0.0 – < 10.0.14393.4704
Microsoft · Windows Server 2016 (Server Core installation)
- affected 10.0.0 – < 10.0.14393.4704
- affected 6.3.0 – < 6.3.9600.20144
Microsoft · Windows Server 2012
- affected 6.2.0 – < 6.2.9200.23490
Microsoft · Windows Server 2012 (Server Core installation)
- affected 6.2.0 – < 6.2.9200.23490
Microsoft · Windows Server 2012 R2
- affected 6.3.0 – < 6.3.9600.20144
Microsoft · Windows Server 2012 R2 (Server Core installation)
- affected 6.3.0 – < 6.3.9600.20144
References (1)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40463 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-40463)Record last updated .