CVE-2024-21343: Microsoft Windows 10 1507

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

Windows Network Address Translation (NAT) Denial of Service Vulnerability

Affected products

• Microsoft Windows 10 1507: before 10.0.10240.20469 (fixed in 10.0.10240.20469)
• Microsoft Windows 10 1607: before 10.0.14393.6709 (fixed in 10.0.14393.6709)
• Microsoft Windows 10 1809: before 10.0.17763.5458 (fixed in 10.0.17763.5458)
• Microsoft Windows 10 21h2: before 10.0.19044.4046 (fixed in 10.0.19044.4046)
• Microsoft Windows 10 22h2: before 10.0.19045.4046 (fixed in 10.0.19045.4046)
• Microsoft Windows 11 21h2: before 10.0.22000.2777 (fixed in 10.0.22000.2777)
• Microsoft Windows 11 22h2: before 10.0.22621.3155 (fixed in 10.0.22621.3155)
• Microsoft Windows 11 23h2: before 10.0.22631.3155 (fixed in 10.0.22631.3155)
• Microsoft Windows Server 2012: version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.6709 (fixed in 10.0.14393.6709)
• Microsoft Windows Server 2019: before 10.0.17763.5458 (fixed in 10.0.17763.5458)
• Microsoft Windows Server 2022: before 10.0.20348.2322 (fixed in 10.0.20348.2322)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.709 (fixed in 10.0.25398.709)

Published 2024-02-13. Last modified 2026-08-10.