CVE-2023-21781 in 3D Builder
Summary
by MITRE • 01/11/2023
3D Builder Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2023-21780, CVE-2023-21782, CVE-2023-21783, CVE-2023-21784, CVE-2023-21785, CVE-2023-21786, CVE-2023-21787, CVE-2023-21788, CVE-2023-21789, CVE-2023-21790, CVE-2023-21791, CVE-2023-21792, CVE-2023-21793.
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Analysis
by VulDB Data Team • 09/25/2025
The CVE-2023-21781 vulnerability represents a critical remote code execution flaw within Microsoft's 3D Builder application, a component of the Windows operating system designed for 3D model creation and manipulation. This vulnerability specifically affects the application's handling of 3D model files, particularly those containing maliciously crafted data structures that can trigger unexpected behavior during file processing. The flaw exists in the parsing logic of the 3D file format loader, where insufficient input validation allows attackers to inject malicious code that executes with the privileges of the targeted user. The vulnerability impacts multiple Windows versions including Windows 10 and Windows 11, making it a widespread concern for enterprise and individual users alike. According to the Common Weakness Enumeration framework, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-787, representing out-of-bounds write vulnerabilities that can lead to arbitrary code execution.
The technical exploitation of CVE-2023-21781 occurs when a user opens a specially crafted 3D model file through the 3D Builder application, triggering a memory corruption issue that allows attackers to execute arbitrary code on the target system. The vulnerability stems from improper bounds checking during the parsing of 3D model metadata, particularly in how the application handles vertex data and texture coordinates within complex 3D files. Attackers can leverage this flaw by embedding malicious payloads within 3D model files, which then get executed when the application processes the file. The attack vector is particularly concerning because it requires minimal user interaction beyond opening the file, making it susceptible to phishing campaigns and malicious file distribution through various channels. The vulnerability can be exploited through multiple 3D file formats supported by 3D Builder, including .obj, .3ds, and .fbx files, each presenting unique attack surfaces that must be considered in threat modeling.
The operational impact of CVE-2023-21781 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and persistent access for threat actors. Once executed, the malicious code can establish backdoors, download additional malware, or escalate privileges to SYSTEM level access, depending on the target system's configuration and user permissions. The vulnerability creates a persistent threat vector that can be leveraged for data exfiltration, lateral movement within networks, and establishment of command and control channels. Organizations running 3D Builder applications are particularly at risk as the software is commonly used in design, engineering, and entertainment industries where users frequently exchange 3D models through various collaboration platforms and file sharing systems. The vulnerability's impact is further amplified by the fact that it can be exploited through social engineering campaigns targeting professionals who regularly use 3D modeling tools, potentially leading to supply chain attacks where malicious 3D models are distributed through legitimate software channels.
Mitigation strategies for CVE-2023-21781 should prioritize immediate patch deployment through Microsoft's regular security updates, which address the core memory handling issues in the 3D Builder application. Organizations should implement application whitelisting policies that restrict execution of 3D Builder on systems where it is not required, particularly in high-risk environments such as financial services or government agencies. Network segmentation and endpoint detection and response solutions can help identify exploitation attempts by monitoring for unusual file processing patterns or network connections initiated by the 3D Builder application. According to the MITRE ATT&CK framework, this vulnerability maps to techniques such as T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter), highlighting the need for comprehensive endpoint protection measures. Security teams should also consider implementing automated file scanning for 3D model files received through email attachments or file sharing systems, as well as establishing incident response procedures specifically for handling potential exploitation attempts. Regular security awareness training for users who work with 3D modeling tools is essential to prevent successful social engineering attacks that leverage this vulnerability.