Microsoft addresses a critical remote code execution flaw in Windows TCP/IP networking components affecting multiple OS versions. Unauthorized attackers could execute arbitrary code via specially crafted packets.
Microsoft has patched a critical remote code execution vulnerability in Windows networking components. Tracked as CVE-2025-13837, this flaw allows unauthenticated attackers to run arbitrary code on unpatched systems. The vulnerability carries a CVSS 9.8 severity rating.
Affected systems include Windows 10 versions 22H2, Windows 11 versions 23H2, and Windows Server 2022. The weakness resides in the Windows TCP/IP stack's packet processing logic. Attackers could exploit it by sending maliciously crafted IPv6 packets to vulnerable systems. Successful exploitation grants SYSTEM-level privileges without user interaction.
Microsoft released fixes through its May 2025 Patch Tuesday updates. Administrators should immediately deploy security updates via Windows Update or the Microsoft Update Catalog. For systems requiring temporary mitigation, block inbound IPv6 traffic at network perimeters until patching completes.
The vulnerability was privately reported through Microsoft's Security Response Center. No public exploits were observed before patching. Microsoft credits security researcher Alex Rivera for discovering the flaw. Organizations should prioritize patching internet-facing Windows systems. Continuous monitoring for anomalous network traffic is recommended.
Technical details are documented in Microsoft's Security Update Guide. System administrators should validate patch deployment using Microsoft's KB5007651 advisory.
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