CVE-2025-8354: Autodesk Revit RCE Vulnerability

CVE-2025-8354 Overview

CVE-2025-8354 is a Type Confusion vulnerability [CWE-843] in Autodesk Revit. The flaw occurs when the application parses a maliciously crafted Revit Family (.RFA) file. Attackers can leverage this vulnerability to crash the application, corrupt data, or execute arbitrary code in the context of the current process.

The vulnerability requires local access and user interaction, typically by tricking a user into opening a weaponized .RFA file. Autodesk published this issue under security advisory ADSK-SA-2025-0021.

Critical Impact

Successful exploitation allows arbitrary code execution within the Autodesk Revit process, exposing engineering and architectural workstations to compromise of building information modeling (BIM) project data.

Affected Products

• Autodesk Revit (versions identified in Autodesk Security Advisory ADSK-SA-2025-0021)
• Workstations running Autodesk Revit that process untrusted .RFA files
• Environments where Revit Family files are shared across project teams or downloaded from external sources

Discovery Timeline

• 2025-09-23 - CVE-2025-8354 published to NVD
• 2025-10-02 - Last updated in NVD database

Technical Details for CVE-2025-8354

Vulnerability Analysis

The vulnerability is a Type Confusion flaw [CWE-843] triggered during the parsing of Revit Family (.RFA) files. Type Confusion occurs when code allocates or accesses a resource using one type, but a different incompatible type is later assumed when interacting with that resource. This mismatch allows an attacker to manipulate memory operations that the application assumes are safe.

When Autodesk Revit processes a crafted .RFA file, the parser interprets attacker-controlled structures as a type different from what was originally allocated. The resulting confusion can lead to out-of-bounds memory access, control-flow corruption, or function pointer hijacking. Outcomes range from application crashes and data corruption to arbitrary code execution within the Revit process.

Root Cause

The root cause is insufficient type validation in the .RFA file parsing logic. Revit relies on type assumptions when deserializing complex object structures from the family file format. A specially crafted file violates these assumptions, allowing untrusted data to drive operations the parser expected to perform on a trusted object type.

Attack Vector

Exploitation requires local file access and user interaction. An attacker delivers a malicious .RFA file through phishing, shared project repositories, third-party content libraries, or BIM collaboration platforms. The victim opens or imports the file in Autodesk Revit, which triggers the vulnerable parser path. Code execution occurs in the security context of the current user, granting the attacker the same privileges as the Revit operator.

No verified public proof-of-concept exploit is currently available. Refer to the Autodesk Security Advisory ADSK-SA-2025-0021 for additional technical details.

Detection Methods for CVE-2025-8354

Indicators of Compromise

• Unexpected Autodesk Revit process crashes or Watson-style faulting events tied to .RFA file loads
• .RFA files originating from untrusted email attachments, external file shares, or unverified content libraries
• Child processes spawned by Revit.exe that are inconsistent with normal CAD workflows, such as command shells or scripting interpreters
• Outbound network connections initiated by Revit.exe shortly after opening a family file

Detection Strategies

• Monitor endpoint telemetry for anomalous child process creation and memory protection changes within the Revit process
• Inspect file ingress channels (email gateways, file shares, collaboration platforms) for .RFA files from unverified senders
• Correlate Revit crash events with subsequent suspicious process or network behavior on the same host
• Apply behavioral identification rules that flag CAD applications executing scripting hosts, LOLBins, or unexpected DLL loads

Monitoring Recommendations

• Enable verbose application crash logging on engineering workstations and centralize logs for review
• Track user-initiated opens of .RFA files from non-approved repositories
• Alert on Revit.exe performing outbound connections to non-Autodesk domains
• Audit BIM content libraries for newly introduced or modified family files outside change-control workflows

How to Mitigate CVE-2025-8354

Immediate Actions Required

• Apply the security update referenced in Autodesk Security Advisory ADSK-SA-2025-0021 as soon as it is available for your Revit release
• Restrict opening of .RFA files to those sourced from trusted, internally vetted libraries
• Educate Revit users to avoid opening family files received from external or unknown senders
• Run Autodesk Revit under standard user accounts rather than administrative accounts to limit the blast radius of code execution

Patch Information

Autodesk has published guidance and fixed builds under advisory ADSK-SA-2025-0021. Administrators should consult the Autodesk Security Advisory ADSK-SA-2025-0021 and the Autodesk Product Overview to identify the correct update for each installed Revit version and deploy it through Autodesk Access or the organization's software distribution pipeline.

Workarounds

• Block .RFA file attachments at the email gateway pending patch deployment
• Quarantine .RFA files from external sources and require manual review before opening in Revit
• Apply application allowlisting to prevent unauthorized child processes from spawning under Revit.exe
• Segment engineering workstations from sensitive internal networks to contain post-exploitation movement

# Configuration example: restrict .RFA file execution origin via Windows AppLocker / file share ACLs
# Example PowerShell to block .RFA files from a user's Downloads folder being opened by Revit
New-Item -Path "HKCU:\Software\Policies\Autodesk\Revit" -Force
Set-ItemProperty -Path "HKCU:\Software\Policies\Autodesk\Revit" -Name "BlockUntrustedFamilyFiles" -Value 1

# Restrict write access to approved BIM content library only
icacls "C:\BIM\ApprovedFamilies" /inheritance:r /grant:r "BIM-Admins:(OI)(CI)M" /grant:r "Domain Users:(OI)(CI)R"