CVE-2025-21131
📋 TL;DR
CVE-2025-21131 is an out-of-bounds write vulnerability in Substance3D Stager that could allow arbitrary code execution when a user opens a malicious file. This affects users of Substance3D Stager versions 3.0.4 and earlier, potentially compromising their systems.
💻 Affected Systems
- Adobe Substance 3D Stager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as 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 only affecting isolated application data.
🎯 Exploit Status
Requires user interaction (opening malicious file) and likely requires crafting specific file formats that trigger the out-of-bounds write.
🛠️ 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 Substance 3D Stager. 2. Go to Help > Check for Updates. 3. Install available updates. 4. Alternatively, download latest version from Adobe Creative Cloud desktop app.
🔧 Temporary Workarounds
Restrict file opening
allOnly open Substance 3D Stager files from trusted sources and avoid opening unknown .sbsar or other project files.
🧯 If You Can't Patch
- Implement application control to restrict Substance 3D Stager from executing unknown code
- Use endpoint protection with behavioral analysis to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Substance 3D Stager version in application or via Creative Cloud app. Versions 3.0.4 or earlier are vulnerable.Check Version:
On Windows: Check 'Help > About Substance 3D Stager'. On macOS: 'Substance 3D Stager > About Substance 3D Stager'Verify Fix Applied:
Verify version is 3.0.5 or later in application settings or Creative Cloud.📡 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 in Substance 3D Stager
SIEM Query:
process_name='Substance3DStager.exe' AND (event_id=1000 OR child_process_creation)