CVE-2025-21161
📋 TL;DR
CVE-2025-21161 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 running version 14.0.2 or earlier of the software, potentially compromising their systems.
💻 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 user's machine, data theft, ransomware deployment, or lateral movement within the network.
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, user privilege restrictions, and file validation preventing successful exploitation.
🎯 Exploit Status
Requires user interaction (opening malicious file) and knowledge of file format exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 14.0.3 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_designer/apsb25-12.html
Restart Required: No
Instructions:
1. Open Substance3D Designer. 2. Go to Help > Check for Updates. 3. Install available updates. 4. Verify version is 14.0.3 or higher.
🔧 Temporary Workarounds
Restrict file opening
allOnly open Substance3D Designer files from trusted sources and avoid opening unknown or suspicious files.
User privilege reduction
allRun Substance3D Designer with limited user privileges to reduce impact of successful exploitation.
🧯 If You Can't Patch
- Discontinue use of Substance3D Designer until patched
- Implement application control to block execution of unpatched versions
🔍 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 14.0.3 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected file processing from untrusted sources
Network Indicators:
- Unusual outbound connections after file processing
- File downloads from suspicious sources
SIEM Query:
EventID=1000 OR EventID=1001 with Application='Substance3D Designer.exe' AND FaultingModule contains memory management modules