CVE-2025-21138
📋 TL;DR
CVE-2025-21138 is an out-of-bounds write vulnerability in Substance3D Designer that could allow arbitrary code execution when a user opens a malicious file. This affects users of Substance3D Designer versions 14.0 and earlier, requiring user interaction for 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 computer in the context of the current user.
Likely Case
Malicious actor tricks user into opening a specially crafted file, leading to malware installation, data theft, or ransomware deployment.
If Mitigated
Limited impact with proper user training and file validation controls preventing malicious files from being opened.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of file format specifics.
🛠️ 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. 4. Verify version is 14.0.1 or later.
🔧 Temporary Workarounds
Restrict file opening
allOnly open Substance3D Designer files from trusted sources and validate file integrity before opening.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized processes
- Use least privilege accounts for Substance3D Designer users
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in application or via Help > About menu.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Confirm version is 14.0.1 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unexpected process creation from Substance3D Designer
- File access errors in application logs
Network Indicators:
- Unusual outbound connections from Substance3D Designer process
SIEM Query:
Process creation where parent_process contains 'Substance3D Designer' AND process_name NOT IN ('expected_processes')