CVE-2021-26879

Windows Network Address Translation (NAT) Denial of Service Vulnerability

Score

CVSS 3.1 7.5 High

Status

Modified - secure@microsoft.com

Published

2021-03-11

Last modified

2026-08-19

Affected products

• Windows 10 (Microsoft)
• Windows 10 1507 (Microsoft)
• Windows 10 1607 (Microsoft)
• Windows 10 1803 (Microsoft)
• Windows 10 1809 (Microsoft)
• Windows 10 1909 (Microsoft)
• Windows 8.1 (Microsoft)
• Windows Server 1909 (Microsoft)
• Windows Server 2004 (Microsoft)
• Windows Server 2012 (Microsoft)
• Windows Server 2012 R2 (Microsoft)
• Windows Server 2016 (Microsoft)
• Windows Server 2019 (Microsoft)
• Windows Server 20H2 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26879
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26879