CVE-2020-1479 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when DirectX improperly handles objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The update addresses the vulnerability by correcting how DirectX handles objects in memory.
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Analysis
by VulDB Data Team • 02/23/2026
The vulnerability identified as CVE-2020-1479 represents a critical elevation of privilege flaw within the DirectX graphics subsystem of Microsoft Windows operating systems. This issue stems from improper handling of memory objects within the DirectX component, creating a pathway for malicious actors to escalate their privileges from standard user level to kernel mode execution. The vulnerability falls under the Common Weakness Enumeration category CWE-121, which specifically addresses stack-based buffer overflow conditions that can lead to arbitrary code execution. The flaw exists within the graphics processing pipeline where DirectX components fail to properly validate or manage memory objects during graphics rendering operations, creating a potential attack surface that could be exploited by malicious software.
The exploitation of this vulnerability requires an initial foothold through user authentication, as attackers must first log into the target system before executing malicious code. Once authenticated, an attacker can leverage a specially crafted application that triggers the memory handling flaw within DirectX, allowing execution of arbitrary code with kernel-level privileges. This kernel mode execution capability provides attackers with complete system control, enabling them to install malicious programs, modify or delete system data, and create new user accounts with full administrative rights. The attack vector specifically targets the graphics subsystem's memory management functions, where DirectX fails to properly validate object boundaries during memory allocation and deallocation processes, potentially allowing memory corruption that can be leveraged for privilege escalation.
From an operational impact perspective, this vulnerability presents a severe threat to enterprise security environments where Windows systems are prevalent. The ability to achieve kernel-level execution from a standard user account fundamentally undermines the security model of Windows operating systems, as it bypasses critical privilege separation mechanisms. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly dangerous in enterprise environments where these systems are commonly deployed. The exploitation process aligns with techniques described in the MITRE ATT&CK framework under the T1068 privilege escalation technique, specifically targeting the use of kernel-mode exploits to gain system-level control. Organizations running affected systems face significant risk of complete system compromise, data exfiltration, and persistent backdoor installation.
Microsoft's official patch addresses this vulnerability by implementing proper memory object validation within the DirectX subsystem, correcting how DirectX components handle memory allocations and object references. The fix involves strengthening input validation routines and implementing proper boundary checking mechanisms in the graphics processing components. Security professionals should prioritize deployment of this update across all affected systems, particularly in environments where user accounts may have elevated privileges or where systems are exposed to untrusted network traffic. The vulnerability highlights the importance of maintaining up-to-date graphics drivers and system components, as DirectX-related exploits often leverage the complex memory management patterns inherent in graphics processing. Organizations should also implement monitoring for suspicious process creation patterns and unauthorized system modifications that could indicate exploitation attempts. The patch demonstrates Microsoft's commitment to addressing kernel-level vulnerabilities and reinforces the necessity of regular security updates to protect against sophisticated attack vectors targeting core operating system components.