CVE-2025-21129
📋 TL;DR
A heap-based buffer overflow vulnerability in Substance3D Stager versions 3.0.4 and earlier allows attackers to execute arbitrary code with the privileges of the current user. This requires the victim to open a malicious file, affecting users of Adobe's 3D staging software.
💻 Affected Systems
- Adobe Substance 3D Stager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the user's system, data theft, and lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, ransomware deployment, or persistence mechanisms installation.
If Mitigated
Limited impact due to user account restrictions, with potential file corruption or application crashes.
🎯 Exploit Status
Requires user interaction (opening malicious file) and buffer overflow exploitation knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.5 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_stager/apsb25-03.html
Restart Required: No
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' section. 3. Find Substance 3D Stager and click 'Update'. 4. Alternatively, download latest version from Adobe website.
🔧 Temporary Workarounds
Restrict file opening
allOnly open trusted Substance 3D Stager files from verified sources.
🧯 If You Can't Patch
- Restrict user permissions to limit potential damage from code execution
- Implement application whitelisting to prevent unauthorized execution
🔍 How to Verify
Check if Vulnerable:
Check Substance 3D Stager version in application 'About' menu or via Creative Cloud app.Check Version:
On Windows: Check 'Help > About Substance 3D Stager'. On macOS: 'Substance 3D Stager > About Substance 3D Stager'.Verify Fix Applied:
Confirm version is 3.0.5 or higher in application 'About' menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected child processes spawned from Substance3DStager.exe
Network Indicators:
- Unusual outbound connections following file opening
SIEM Query:
Process creation where parent_process_name contains 'Substance3DStager' AND (process_name not in allowed_list)