CVE-2025-21164 Overview
CVE-2025-21164 is an out-of-bounds write vulnerability [CWE-787] affecting Adobe Substance 3D Designer versions 14.1 and earlier. The flaw allows arbitrary code execution in the context of the current user when a victim opens a maliciously crafted file. Adobe published the issue in security advisory APSB25-62 on July 8, 2025.
The vulnerability requires local access and user interaction, limiting remote exploitation. However, attackers can deliver malicious project files through phishing campaigns or compromised asset repositories targeting 3D artists and designers.
Critical Impact
Successful exploitation enables arbitrary code execution under the current user's privileges, allowing attackers to install malware, steal data, or pivot within the host environment.
Affected Products
- Adobe Substance 3D Designer 14.1
- Adobe Substance 3D Designer versions prior to 14.1
- Windows and macOS installations of Substance 3D Designer
Discovery Timeline
- 2025-07-08 - CVE-2025-21164 published to NVD and Adobe releases security advisory APSB25-62
- 2025-07-11 - Last updated in NVD database
Technical Details for CVE-2025-21164
Vulnerability Analysis
The vulnerability is an out-of-bounds write condition in Adobe Substance 3D Designer, a procedural 3D material authoring application. Out-of-bounds write flaws occur when an application writes data past the end or before the beginning of an allocated buffer. The corrupted memory can include adjacent objects, function pointers, or control structures used by the application's runtime.
In Substance 3D Designer, the flaw is triggered while parsing a malformed file. An attacker crafts a project, material, or asset file with manipulated structures that cause the application to compute incorrect buffer offsets during deserialization. The application then writes attacker-controlled bytes outside the intended buffer.
Root Cause
The root cause is insufficient bounds checking during file parsing operations. The application trusts size or index fields embedded in the file format without validating them against the actual allocated buffer size. This permits memory corruption with attacker-controlled values.
Attack Vector
Exploitation requires local file access and user interaction. The victim must open a malicious Substance 3D Designer file delivered through email, shared asset libraries, marketplaces, or chat platforms. Once opened, the parser triggers the out-of-bounds write, enabling code execution at the privilege level of the logged-in user.
No verified public proof-of-concept code is available. Refer to the Adobe Security Advisory APSB25-62 for vendor technical context.
Detection Methods for CVE-2025-21164
Indicators of Compromise
- Unexpected child processes spawned by Adobe Substance 3D Designer.exe, particularly shells, scripting interpreters, or rundll32.exe
- Substance 3D Designer process crashes or memory access violations logged in Windows Event Viewer or macOS unified logs
- Suspicious Substance project files (.sbs, .sbsar) received from untrusted sources or with anomalous file sizes
Detection Strategies
- Monitor for process lineage anomalies where Substance 3D Designer launches non-graphical or system utilities
- Hunt for outbound network connections initiated by the Substance 3D Designer process to non-Adobe infrastructure
- Inspect endpoint telemetry for memory protection violations and crash dumps originating from the Substance 3D Designer binary
Monitoring Recommendations
- Enable application crash reporting and forward crash telemetry to a centralized logging platform for correlation
- Track file write operations performed by Substance 3D Designer outside its standard project directories
- Alert on installations of Substance 3D Designer reporting versions at or below 14.1 across managed endpoints
How to Mitigate CVE-2025-21164
Immediate Actions Required
- Upgrade Adobe Substance 3D Designer to the fixed version listed in the Adobe Security Advisory APSB25-62
- Inventory endpoints running Substance 3D Designer 14.1 or earlier and prioritize patching for systems handling external assets
- Instruct users to avoid opening Substance 3D Designer files from untrusted sources, marketplaces, or unsolicited messages
Patch Information
Adobe released a patched version of Substance 3D Designer alongside advisory APSB25-62 on July 8, 2025. Administrators should deploy the update through Adobe Creative Cloud or enterprise distribution channels. Validate the installed version after deployment to confirm remediation.
Workarounds
- Restrict execution of Substance 3D Designer to systems with standard user privileges, limiting impact if exploited
- Block inbound .sbs and .sbsar attachments at email gateways pending patch deployment
- Open untrusted Substance files only inside isolated virtual machines without access to sensitive data or credentials
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
