Critical Microsoft Vulnerability CVE-2025-68776 Exposes Systems to Remote Attacks

Microsoft has issued a critical security alert for CVE-2025-68776. This vulnerability allows remote attackers to execute arbitrary code on unpatched systems. Successful exploitation requires no user interaction.

Affected products include Windows 11 versions 22H2-24H1, Windows Server 2022, and Azure Stack Hub. Full version listings appear in Microsoft's Security Update Guide. The vulnerability resides in the TCP/IP network stack. Attackers can trigger memory corruption via malicious network packets.

This flaw received a CVSS v3.1 score of 9.8 (Critical). The maximum severity rating reflects its network-based attack vector and low attack complexity. Microsoft confirmed exploitation attempts may bypass standard security controls.

Apply security updates immediately through Windows Update or the Microsoft Update Catalog. Until patching, block TCP port 445 at network boundaries. Enable Windows Defender Firewall with advanced security rules. Monitor for anomalous outbound connections.

Microsoft released patches on October 8, 2025. Unpatched systems remain vulnerable to weaponized attacks. The MSRC advisory confirms active exploitation detection capabilities are available through Microsoft Defender for Endpoint.