CVE-2026-42904
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Heap-based Buffer Overflow in Windows TCP/IP

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-42904
EUVD
EUVD-2026-35593
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_tcp_ip *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability is a heap-based buffer overflow in the Windows TCP/IP stack. It allows an unauthorized attacker who is on an adjacent network to exploit the flaw and elevate their privileges on the affected system.

Impact Analysis

The impact of this vulnerability is that an attacker can gain elevated privileges on a Windows system without authorization. This means the attacker could potentially execute code with higher permissions, leading to full system compromise, data theft, or disruption of services.

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