External risk intelligence

Assimp FBX Importer could allow external attacker to take control of systems

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-70067

An external attacker can take control of systems using the Assimp library by providing a maliciously crafted 3D model file. If opened, this allows the attacker to run unauthorized code on the host system, potentially leading to a complete compromise of the affected application.

1Halo Surface Signal

Buffer Overflow

External exposure likelihood

Halo Surface Signal score for CVE-2025-70067

Assimp is a file-parsing library integrated into client-side applications or internal data pipelines. The vulnerability is triggered by processing a specifically crafted 3D model file rather than through interaction with a public-facing network service, remote access gateway, or internet-exposed endpoint.

Horizon Alert

Summary of the vulnerability and why it matters

A buffer overflow vulnerability exists in Assimp, a library for parsing 3D model files. This issue can be triggered when processing a specially crafted FBX file, potentially leading to serious consequences like code execution. Teams should pay attention because a flaw in a widely used library can have broad downstream effects.

  • Can lead to uncontrolled code execution.
  • Affects applications that process FBX files.
  • Requires processing a malicious file.

Attack Path

How an attacker could exploit the issue

An attacker could weaponize this by sending a crafted FBX file to a victim, triggering a buffer overflow when the file is processed by the Assimp library. This overflow could lead to arbitrary code execution, allowing the attacker to compromise the victim's system.

  • Requires user interaction.
  • Vulnerable FBX import function.
  • Target data processing pipelines.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Assimp's FBX importer could be attractive to attackers due to its critical severity and potential for remote code execution. However, exploitation typically requires the user to open a malicious file, making it more suitable for targeted attacks or social engineering campaigns rather than widespread, automated exploitation.

  • Triggered by opening crafted files.
  • No public exploit code observed.
  • Last modified over a year ago.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize identifying and blocking any network traffic attempting to deliver crafted FBX files to systems processing them, especially since this is a critical, remotely exploitable buffer overflow. If affected services cannot be immediately updated to Assimp 6.0.2, isolate them from untrusted input sources to prevent exploitation.

  • Update Assimp to 6.0.2.
  • Isolate services from untrusted FBX files.
  • Monitor for malformed FBX file processing attempts.

Frequently asked questions

What is Assimp and its primary function in 3D model processing?

Assimp (Open Asset Import Library) is an open-source software library that serves as a crucial tool for developers. It simplifies the process of loading and processing 3D model files from a wide array of formats, including the widely used FBX format, enabling applications to integrate and utilize complex 3D data for various visual applications.

What type of vulnerability is CVE-2025-70067 and where does it reside within Assimp?

CVE-2025-70067 is classified as a Buffer Overflow vulnerability. This specific flaw is located within Assimp's FBX Importer, affecting versions up to 6.0.2. The issue is triggered during the processing of a crafted FBX file when copying a property key string into a fixed-size heap buffer without proper length validation, as detailed in the function aiMaterial::AddBinaryProperty.

How is CVE-2025-70067 triggered and what is the scope of its impact?

The vulnerability is triggered when Assimp processes an FBX file that has been specifically crafted to exploit a buffer overflow. This occurs because the `strcpy()` function is used to copy a property key string into a fixed-size heap buffer without checking its length first. This can lead to overwriting adjacent memory, potentially causing unintended program behavior or crashes.

What is the relevance of Assimp's CVE-2025-70067 vulnerability, considering its potential impact?

Assimp's FBX importer vulnerability, CVE-2025-70067, is highly relevant due to its critical severity and the potential for arbitrary code execution. While exploitation typically requires a user to open a malicious file, this makes it a risk for targeted attacks or social engineering campaigns, especially since a flaw in a widely used library can have extensive downstream consequences.

What are the recommended steps to mitigate the risks associated with Assimp's FBX importer vulnerability?

To mitigate risks, it is recommended to update Assimp to version 6.0.2 or later. If an immediate update is not feasible, isolating services that process FBX files from untrusted input sources is crucial. Additionally, monitoring for attempts to process malformed FBX files can help prevent exploitation of this vulnerability.

References