CVE-2021-26879 json
Windows Network Address Translation (NAT) Denial of Service Vulnerability
published 2021-03-11 5 y ago modified 2026-08-19 2 mo ago also EUVD-2021-13663
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.9%
- EPSS 3.9% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known
Summary
Windows Network Address Translation (NAT) Denial of Service Vulnerability
Patch / fix
- Microsoft Windows 10 Version 1507 10.0.10240.18874
- Microsoft Windows 10 Version 1607 10.0.14393.4283
- Microsoft Windows 10 Version 1803 10.0.17134.2087
- Microsoft Windows 10 Version 1809 10.0.17763.1817
- Microsoft Windows 10 Version 1909 10.0.18363.1440
- Microsoft Windows 10 Version 2004 10.0.19043.867
- Microsoft Windows 8.1 6.3.9600.19968
- Microsoft Windows Server 2012 R2 6.3.9600.19968
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.19968
- Microsoft Windows Server 2016 10.0.14393.4283
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4283
- Microsoft Windows Server 2019 10.0.17763.1817
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.1817
- Microsoft Windows Server version 2004 10.0.19043.867
- Microsoft Windows Server version 20H2 10.0.19043.867
- Microsoft Windows Server, version 1909 (Server Core installation) 10.0.18363.1440
Exploit prediction
3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- Microsoft Windows 10 Version 1507
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1803
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 1909
- Microsoft Windows 10 Version 2004
- Microsoft Windows 8.1
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core installation)
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows Server version 2004
- Microsoft Windows Server version 20H2
- Microsoft Windows Server, version 1909 (Server Core installation)
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-26879
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-26879
patch, vendor-advisory
Sources
- CVE List CVE-2021-26879
- NVD CVE-2021-26879
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.