CVE-2025-21166
📋 TL;DR
CVE-2025-21166 is an out-of-bounds write vulnerability in Substance3D Designer that allows arbitrary code execution when a user opens a malicious file. This affects users of Substance3D Designer versions 14.1 and earlier, requiring user interaction to trigger exploitation.
💻 Affected Systems
- Adobe Substance3D Designer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's machine in the context of the current user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation leading to malware installation, data exfiltration, or persistence mechanisms being established on the affected system.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially containing the exploit to the application context only.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 14.2 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_designer/apsb25-62.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to Apps tab. 3. Find Substance3D Designer and click Update. 4. Wait for installation to complete. 5. Restart the application.
🔧 Temporary Workarounds
Restrict file opening
allImplement policies to prevent opening untrusted Substance3D Designer files
Application sandboxing
allRun Substance3D Designer in a sandboxed environment to limit potential damage
🧯 If You Can't Patch
- Implement strict file handling policies to prevent opening untrusted Substance3D Designer files
- Run Substance3D Designer with minimal user privileges and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in Help > About Substance3D Designer menuCheck Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is 14.2 or later in Help > About Substance3D Designer📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Suspicious file opening events from Substance3D Designer
- Unusual process creation from Substance3D Designer
Network Indicators:
- Outbound connections from Substance3D Designer to unknown IPs
- DNS queries for suspicious domains from the application
SIEM Query:
process_name:"Substance3D Designer.exe" AND (event_type:process_creation OR event_type:file_access)