Microsoft confirms critical remote code execution flaw (CVE-2026-20814) in Windows systems. Attackers can hijack unpatched devices. Apply updates immediately.
A critical security flaw in Microsoft Windows enables remote attackers to execute malicious code. Tracked as CVE-2026-20814, this vulnerability carries a CVSS v3.1 score of 9.8 (Critical). Successful exploitation grants full system control to attackers without user interaction.
Affected products include Windows 10 versions 21H2 through 22H2, Windows 11 versions 21H2 and 22H2, and Windows Server 2022. The vulnerability resides in the Windows TCP/IP stack. Specifically, improper handling of IPv6 packets creates a buffer overflow condition. Attackers exploit this by sending specially crafted network packets to vulnerable systems.
Microsoft released patches on June 14, 2026. Apply updates immediately through Windows Update or the Microsoft Update Catalog. Enterprise administrators should prioritize deployment via Windows Server Update Services.
No viable workarounds exist. Network segmentation provides partial mitigation. Block TCP port 445 at perimeter firewalls where feasible. Microsoft credits security researcher Alex Rivera for reporting the flaw through coordinated disclosure.
Monitor the official Microsoft Security Response Center for updates. Security teams should scan networks for unpatched systems using Microsoft Defender for Endpoint.
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