CVE-2026-40399 PUBLISHED

Windows TCP/IP Elevation of Privilege Vulnerability

Assigner: microsoft
Reserved: 13.04.2026 Published: 12.05.2026 Updated: 13.05.2026

Stack-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Metrics

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS Score: 7.8

Product Status

Vendor Microsoft
Product Windows 10 Version 1607
Versions
  • affected from 10.0.14393.0 to 10.0.14393.9140 (excl.)
Vendor Microsoft
Product Windows 10 Version 1809
Versions
  • affected from 10.0.17763.0 to 10.0.17763.8755 (excl.)
Vendor Microsoft
Product Windows 10 Version 21H2
Versions
  • affected from 10.0.19044.0 to 10.0.19044.7291 (excl.)
Vendor Microsoft
Product Windows 10 Version 22H2
Versions
  • affected from 10.0.19045.0 to 10.0.19045.7291 (excl.)
Vendor Microsoft
Product Windows 11 version 22H3
Versions
  • affected from 10.0.22631.0 to 10.0.22631.7079 (excl.)
Vendor Microsoft
Product Windows 11 Version 23H2
Versions
  • affected from 10.0.22631.0 to 10.0.22631.7079 (excl.)
Vendor Microsoft
Product Windows 11 Version 24H2
Versions
  • affected from 10.0.26100.0 to 10.0.26100.8457 (excl.)
Vendor Microsoft
Product Windows 11 Version 25H2
Versions
  • affected from 10.0.26200.0 to 10.0.26200.8457 (excl.)
Vendor Microsoft
Product Windows 11 version 26H1
Versions
  • affected from 10.0.28000.0 to 10.0.28000.2113 (excl.)
Vendor Microsoft
Product Windows Server 2016
Versions
  • affected from 10.0.14393.0 to 10.0.14393.9140 (excl.)
Vendor Microsoft
Product Windows Server 2016 (Server Core installation)
Versions
  • affected from 10.0.14393.0 to 10.0.14393.9140 (excl.)
Vendor Microsoft
Product Windows Server 2019
Versions
  • affected from 10.0.17763.0 to 10.0.17763.8755 (excl.)
Vendor Microsoft
Product Windows Server 2019 (Server Core installation)
Versions
  • affected from 10.0.17763.0 to 10.0.17763.8755 (excl.)
Vendor Microsoft
Product Windows Server 2022
Versions
  • affected from 10.0.20348.0 to 10.0.20348.5139 (excl.)
Vendor Microsoft
Product Windows Server 2022, 23H2 Edition (Server Core installation)
Versions
  • affected from 10.0.25398.0 to 10.0.25398.2330 (excl.)
Vendor Microsoft
Product Windows Server 2025
Versions
  • affected from 10.0.26100.0 to 10.0.26100.32860 (excl.)
Vendor Microsoft
Product Windows Server 2025 (Server Core installation)
Versions
  • affected from 10.0.26100.0 to 10.0.26100.32860 (excl.)

References

Problem Types