CVE-2025-1656 is a heap-based buffer overflow vulnerability classified under CWE-122 affecting Autodesk Revit versions 2023 through 2025. The flaw arises when a maliciously crafted PDF file is linked or imported into the Revit application, causing improper memory handling that leads to a heap overflow. This memory corruption can be exploited to crash the application, leak sensitive information from memory, or execute arbitrary code with the privileges of the Revit process. The vulnerability requires user interaction (importing or linking the PDF) but does not require any prior authentication, making it accessible to external attackers who can deliver malicious PDFs. The CVSS v3.1 base score is 7.8, reflecting high severity with attack vector local (requiring user action on a local system), low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability. No public exploit code or active exploitation has been reported yet. Autodesk has acknowledged the issue but has not published patches as of the information date. The vulnerability is particularly dangerous in environments where Revit is used to handle sensitive architectural or engineering data, as exploitation could compromise intellectual property or disrupt workflows.

The vulnerability can have severe consequences for organizations relying on Autodesk Revit for architectural, engineering, and construction workflows. Successful exploitation can lead to arbitrary code execution, enabling attackers to take control of the affected system with the privileges of the Revit application user. This can result in theft of sensitive design data, intellectual property exposure, and potential disruption of critical project timelines due to application crashes or system instability. The confidentiality, integrity, and availability of data processed by Revit are all at risk. Given the widespread use of Revit in industries such as construction, engineering, and infrastructure, the impact could extend to critical infrastructure projects and large-scale commercial developments. The requirement for user interaction limits remote exploitation but does not eliminate risk, especially in environments where users frequently import external PDFs. The absence of patches increases exposure until mitigations or updates are applied.

1. Until official patches are released, restrict or monitor the import and linking of PDF files within Autodesk Revit, especially from untrusted or external sources. 2. Implement strict email and file filtering to block or quarantine suspicious PDF attachments before they reach end users. 3. Educate users about the risks of opening or importing PDFs from unknown or untrusted origins and enforce policies to verify file sources. 4. Use application whitelisting and endpoint protection solutions capable of detecting anomalous behavior or exploitation attempts within Revit processes. 5. Run Revit with the least privileges necessary to limit the impact of potential code execution. 6. Employ network segmentation to isolate systems running Revit from less trusted network zones. 7. Monitor system and application logs for unusual crashes or suspicious activity related to PDF handling. 8. Prepare for rapid deployment of patches once Autodesk releases updates addressing this vulnerability.