CVE-2016-9303 in FBX-SDK
Summary
by MITRE
Multiple buffer overflows in the Autodesk FBX-SDK before 2017.1 can allow attackers to execute arbitrary code or cause an infinite loop condition when reading or converting malformed FBX format files.
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Analysis
by VulDB Data Team • 05/14/2026
The Autodesk FBX-SDK vulnerability identified as CVE-2016-9303 represents a critical security flaw affecting versions prior to 2017.1, where multiple buffer overflows exist within the software development kit's handling of FBX format files. This vulnerability stems from inadequate input validation and memory management practices when processing malformed FBX files, creating opportunities for attackers to manipulate the software's behavior through crafted file inputs. The FBX format is widely used for exchanging 3D assets between different Autodesk products and third-party applications, making this vulnerability particularly dangerous in environments where 3D content is frequently shared and processed. The vulnerability specifically affects the SDK's file reading and conversion functionalities, where insufficient bounds checking allows attackers to overflow buffers and potentially overwrite adjacent memory locations.
The technical implementation of this vulnerability manifests through improper memory allocation and handling of variable-length data structures within the FBX file parser. When the SDK encounters malformed FBX files containing oversized or malformed data fields, the buffer overflow conditions occur during parsing operations that expect specific data sizes but receive unexpectedly large inputs. This creates opportunities for attackers to inject malicious code into the memory space of the application or manipulate program execution flow through stack corruption. The vulnerability is classified under CWE-121 as "Stack-based Buffer Overflow" and CWE-122 as "Heap-based Buffer Overflow" in the Common Weakness Enumeration catalog, indicating both stack and heap memory corruption possibilities. The attack surface is broadened by the fact that the vulnerability can be triggered through legitimate file conversion operations, making it difficult to distinguish between benign and malicious file processing.
The operational impact of CVE-2016-9303 extends beyond simple code execution to include potential denial of service conditions through infinite loop scenarios. Attackers can craft FBX files that cause the SDK to enter infinite loops during parsing operations, leading to resource exhaustion and system instability. This dual nature of the vulnerability means that organizations using the affected SDK versions face both active exploitation risks and passive system degradation threats. The vulnerability is particularly concerning in professional 3D content creation environments where users frequently exchange files between different software platforms, as a single malicious FBX file can compromise entire workflows. The ATT&CK framework categorizes this vulnerability under T1059 as "Command and Scripting Interpreter" and T1499 as "Endpoint Denial of Service," highlighting both code execution and system availability attack vectors. Organizations that rely on Autodesk's FBX-SDK for 3D asset processing, content distribution, or integration with other applications face significant risk exposure.
Mitigation strategies for CVE-2016-9303 require immediate software updates to Autodesk FBX-SDK version 2017.1 or later, which contain the necessary patches addressing the buffer overflow conditions. System administrators should implement strict file validation procedures for all FBX content, including sandboxed processing environments and automated scanning for malformed files before integration into production workflows. The implementation of input sanitization measures and enhanced memory protection mechanisms can provide additional defense layers. Organizations should also consider network segmentation to limit exposure of systems that process FBX files, combined with regular security assessments of 3D content pipelines. The vulnerability underscores the importance of keeping third-party SDKs updated and implementing comprehensive security testing procedures for file processing components. Additionally, monitoring for unusual processing patterns or resource consumption spikes can help detect exploitation attempts, while maintaining detailed audit logs of all FBX file operations provides forensic capabilities for incident response activities.