EUVD-2026-56384
GHSA-mm4x-wv7q-q9j8
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-delivered and unauthenticated with full kernel-level CIA impact; AC:H retained because exploitation requires specific TCP protocol state conditions per available data.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via a stack-based buffer overflow in the Windows kernel TCP/IP driver (CWE-121) affects all major Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025. An unauthenticated remote attacker who can deliver crafted TCP/IP packets to an exposed system may gain kernel-level code execution without requiring user interaction. No public exploit or CISA KEV listing has been identified at time of analysis, though the kernel-mode attack surface and network-accessible delivery make this a high-priority patching target; Microsoft has released patches for all affected platforms.
Technical ContextAI
CWE-121 (Stack-Based Buffer Overflow) occurs when externally supplied data written into a fixed-size stack buffer exceeds its bounds, overwriting adjacent stack frames, saved return addresses, or function pointers, allowing an attacker to redirect execution flow. The vulnerable component is the Windows TCP/IP kernel driver (tcpip.sys), which processes raw network packets in kernel mode at elevated privilege. Because the driver handles inbound traffic before any user-mode filtering, malformed packets can trigger the overflow before authentication or session state is established. Affected CPE ranges span Windows 10 (builds 10.0.14393.x, 10.0.19044.x, 10.0.19045.x), Windows 11 (10.0.22631.x, 10.0.26100.x, 10.0.26200.x, 10.0.28000.x), and Windows Server 2012 through 2025 across both full and Server Core installation variants, per EUVD-2026-56384.
RemediationAI
Apply the Microsoft-released security update for the specific Windows version in use; patches are confirmed available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62792 - consult that page for the exact updated build number per platform, as the intelligence data confirms patch availability but does not enumerate individual fix build numbers. Systems running Windows Server 2012 and Server 2012 R2 are past standard end-of-support and require Extended Security Update (ESU) enrollment to receive the patch; organizations without ESU coverage should prioritize emergency isolation of those systems. As a compensating control prior to patching, implement inbound TCP filtering at network perimeter firewalls to block unsolicited TCP connections to affected hosts from untrusted network segments; note this does not protect against attacks originating from already-permitted network paths (e.g., internal lateral movement or DMZ-to-host traffic). No vendor-confirmed workaround short of patching has been identified in the available data.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today