CVE-2025-21136
📋 TL;DR
CVE-2025-21136 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 or data theft.
If Mitigated
User opens file from untrusted source but system has application sandboxing, resulting in limited impact.
🎯 Exploit Status
Exploitation requires user to open a malicious file. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to version 14.1 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. Follow prompts to install version 14.1 or later. 4. Verify update completed successfully.
🔧 Temporary Workarounds
Restrict file opening
allOnly open Substance3D Designer files from trusted sources. Implement file type restrictions.
Application control
allUse application whitelisting to prevent execution of unauthorized code.
🧯 If You Can't Patch
- Implement strict file handling policies - only open files from verified sources
- Use endpoint protection with behavioral analysis to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in application (Help > About). If version is 14.0 or earlier, system is vulnerable.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is 14.1 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_name contains 'Substance3D Designer' AND process_name not in expected_substance_processes