CVE-2025-8893: Autodesk Revit RCE Vulnerability

CVE-2025-8893 Overview

CVE-2025-8893 is an out-of-bounds write vulnerability [CWE-787] affecting multiple Autodesk products that parse PDF files. A maliciously crafted PDF, when opened in an affected Autodesk application, triggers memory corruption during parsing. Attackers can leverage this flaw to crash the application, corrupt data, or execute arbitrary code in the context of the current user process. The vulnerability requires local file interaction and user action to open the malicious PDF, but no prior authentication is needed. Autodesk published security advisory ADSK-SA-2025-0018 to address the issue across its AutoCAD, Revit, and Civil 3D product families.

Critical Impact

Arbitrary code execution in the context of the current user, leading to potential data corruption, application crash, or full compromise of the engineering workstation.

Affected Products

• Autodesk Revit
• Autodesk AutoCAD and AutoCAD LT
• Autodesk AutoCAD Architecture, Electrical, Mechanical, MEP, Map 3D, Plant 3D
• Autodesk Advance Steel and Civil 3D

Discovery Timeline

• 2025-09-16 - CVE-2025-8893 published to NVD
• 2025-09-19 - Last updated in NVD database

Technical Details for CVE-2025-8893

Vulnerability Analysis

The flaw is an out-of-bounds write [CWE-787] in the PDF parsing component shared across Autodesk's design product line. When the affected application processes a malformed PDF, the parser writes data past the bounds of an allocated buffer. This corrupts adjacent memory structures, including function pointers and heap metadata. Attackers who control the contents of the malicious PDF can shape the corruption to overwrite specific memory locations.

Successful exploitation grants code execution at the privilege level of the user running the Autodesk application. Engineering and architecture environments commonly run these applications with elevated privileges to access network shares and design repositories, amplifying impact.

Root Cause

The root cause is insufficient bounds checking in the PDF parsing logic embedded in Autodesk products. The parser fails to validate the size or offset of attacker-controlled fields within the PDF structure before writing data to a fixed-size buffer. Autodesk has not published the specific function or object type affected. Refer to the Autodesk Security Advisory ADSK-SA-2025-0018 for vendor-confirmed technical details.

Attack Vector

Exploitation requires an attacker to deliver a crafted PDF to a victim and convince the user to open the file with an affected Autodesk product. Common delivery methods include phishing emails with PDF attachments, malicious file shares, or supply chain compromise of design assets. Once the victim opens the file, the parser executes the embedded malicious payload without additional interaction.

// No verified public proof-of-concept is available for CVE-2025-8893.
// Refer to Autodesk advisory ADSK-SA-2025-0018 for vendor-confirmed details.

Detection Methods for CVE-2025-8893

Indicators of Compromise

• Unexpected crashes or Watson error reports from acad.exe, Revit.exe, or related Autodesk processes immediately after opening a PDF.
• Autodesk processes spawning unusual child processes such as cmd.exe, powershell.exe, or rundll32.exe.
• Outbound network connections initiated by Autodesk applications to non-Autodesk infrastructure shortly after file open events.

Detection Strategies

• Monitor process creation events where Autodesk binaries are the parent of script interpreters or LOLBins.
• Inspect file open telemetry for PDF files opened by Autodesk applications from non-trusted locations such as email attachment directories or downloads folders.
• Correlate Autodesk application crashes with subsequent file system or registry modifications on the same host.

Monitoring Recommendations

• Enable verbose application crash logging and forward Windows Error Reporting events to a central SIEM.
• Track endpoint memory protection alerts (DEP, ASLR violations) generated by Autodesk processes.
• Audit user accounts that frequently exchange PDF files with external parties and review their endpoint telemetry.

How to Mitigate CVE-2025-8893

Immediate Actions Required

• Apply the patches referenced in Autodesk Security Advisory ADSK-SA-2025-0018 using Autodesk Access.
• Inventory all installations of AutoCAD, Revit, Civil 3D, and related products to confirm patch coverage.
• Restrict the opening of PDF files from untrusted sources within Autodesk applications.

Patch Information

Autodesk released fixed builds for the affected products through Autodesk Access. Customers should consult Autodesk Access Overview for the update mechanism and ADSK-SA-2025-0018 for the specific fixed version per product.

Workarounds

• Do not open PDF files received from untrusted or unverified sources within Autodesk products.
• Use a hardened standalone PDF viewer for previewing externally sourced PDFs before importing them into design workflows.
• Run Autodesk applications under standard user accounts rather than administrative accounts to limit blast radius.

# Verify installed Autodesk product version on Windows
reg query "HKLM\SOFTWARE\Autodesk\AutoCAD" /s /v ProductVersion