CVE-2025-21139
📋 TL;DR
CVE-2025-21139 is a heap-based buffer overflow vulnerability in Substance3D Designer that allows arbitrary code execution when a user opens a malicious file. This affects users of Substance3D Designer version 14.0 and earlier. Successful exploitation requires user interaction through opening a specially crafted file.
💻 Affected Systems
- Adobe Substance3D Designer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete 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 due to user awareness training preventing malicious file opening, with potential application crash but no code execution.
🎯 Exploit Status
Exploitation requires user to open a malicious file; no public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 14.0.1 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_designer/apsb25-06.html
Restart Required: No
Instructions:
1. Open Substance3D Designer. 2. Go to Help > Check for Updates. 3. Install available updates to version 14.0.1 or later. 4. Verify installation by checking version in About dialog.
🔧 Temporary Workarounds
Restrict file opening
allOnly open Substance3D Designer files from trusted sources and avoid opening unknown or suspicious files.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized files.
- Use endpoint protection with behavioral analysis to detect and block exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in Help > About dialog. If version is 14.0 or earlier, system is vulnerable.Check Version:
Not applicable - check via application GUI Help > About dialog.Verify Fix Applied:
Verify version is 14.0.1 or later in Help > About dialog after applying update.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unusual file opening events from Substance3D Designer
Network Indicators:
- No direct network indicators as exploitation is file-based
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName='Substance3D Designer.exe' AND (ExceptionCode=0xc0000005 OR ExceptionCode=0xc0000409)