CVE-2026-42904 CRITICAL

CVE-2026-42904: Windows TCP/IP Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows 10 Version 21H2
Weakness CWE-122
Published June 9, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

9.6/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 15, 2026 Record updated