by Kastro
Paper/Archive/CVE-2026-42904

CVE-2026-42904

Microsoft Windows 10 Version 21H2 — Windows TCP/IP Elevation of Privilege Vulnerability

EPSS 0.4%CVSS 9.6
critical.is priorityof 100
36
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 38.1.381 × 207.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.

Affected

ProductAffectedFixed inSource
Windows 10 Version 21H210.0.19044.0 – < 10.0.19044.741710.0.19044.7417CNA
Windows 10 Version 22H210.0.19045.0 – < 10.0.19045.741710.0.19045.7417CNA
Windows 11 version 23H210.0.22631.0 – < 10.0.22631.721910.0.22631.7219CNA
Windows 11 Version 23H210.0.22631.0 – < 10.0.22631.721910.0.22631.7219CNA
Windows 11 Version 24H210.0.26100.0 – < 10.0.26100.865510.0.26100.8655CNA
Windows 11 Version 25H210.0.26200.0 – < 10.0.26200.865510.0.26200.8655CNA
Windows 11 version 26H110.0.28000.0 – < 10.0.28000.226910.0.28000.2269CNA
Windows Server 202210.0.20348.0 – < 10.0.20348.525610.0.20348.5256CNA
Windows Server 202510.0.26100.0 – < 10.0.26100.3299510.0.26100.32995CNA
Windows Server 2025 (Server Core installation)10.0.26100.0 – < 10.0.26100.3299510.0.26100.32995CNA

Scores by source

microsoft (CNA)9.6CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-42904