CVE-2026-83714 in Windows
Summary
by MITRE • 10/14/2026
Use of uninitialized resource in Windows HTTP.sys allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as CVE-2024-30107 represents a critical security flaw within the Hypertext Transfer Protocol (HTTP) server service, commonly referred to as http.sys, which is a core component of Microsoft Windows operating systems. This specific issue stems from an improper initialization of memory resources during the processing of HTTP requests. When the system handles certain network packets or malformed input data, it fails to properly initialize internal variables or buffers before they are utilized in subsequent operations. This oversight leads to the reading of uninitialized memory locations, which may contain sensitive information previously stored by other processes or kernel structures that have not yet been cleared from RAM.
From a technical perspective, this flaw is classified under CWE-457, which denotes the use of an uninitialized variable. The root cause lies in the complex logic governing how http.sys parses and validates incoming HTTP traffic. In specific edge cases involving particular header configurations or payload structures, the execution path bypasses standard initialization routines. Consequently, when the system attempts to process these requests, it reads from memory addresses that have not been explicitly set to a known state by the application code. This behavior creates an information disclosure vector where an attacker can potentially extract kernel-mode data or sensitive user context through carefully crafted network packets sent to the vulnerable service.
The operational impact of this vulnerability is significant because http.sys operates at a high privilege level within the Windows architecture, handling low-level networking functions for IIS and other HTTP-based services. An authorized local attacker who has valid credentials on the system can exploit this flaw to read arbitrary memory contents. While the primary consequence described is information disclosure, such leaks can serve as a stepping stone for more severe attacks. By analyzing the leaked data, an attacker might gain insights into internal system states, cryptographic keys, or session tokens that could facilitate further exploitation, including privilege escalation or remote code execution in conjunction with other vulnerabilities. This aligns with ATT&CK technique T1083, which covers file and directory discovery, although here it extends to memory content extraction rather than just filesystem access.
Mitigation strategies for this vulnerability primarily involve applying the latest security updates provided by Microsoft. Organizations should ensure that all Windows systems are patched to versions where http.sys has been updated with proper initialization checks and bounds validation logic. In environments where immediate patching is not feasible, network segmentation can help mitigate risk by restricting direct access to ports served by IIS or other services relying on http.sys from untrusted networks. Additionally, deploying intrusion detection systems that monitor for anomalous HTTP traffic patterns associated with memory corruption attempts can provide an additional layer of defense. Regular auditing of system logs and monitoring for unusual memory usage spikes may also aid in early detection of exploitation attempts targeting this specific flaw.