CVE-2025-21165 Overview
CVE-2025-21165 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 crafted file. Adobe published the fix in security advisory APSB25-62. The vulnerability requires local file handling and user interaction, limiting remote exploitation but creating risk in workflows that involve untrusted asset sharing among 3D artists and developers.
Critical Impact
Successful exploitation enables arbitrary code execution with the privileges of the user running Substance 3D Designer, potentially compromising creative pipelines and connected systems.
Affected Products
- Adobe Substance 3D Designer 14.1
- Adobe Substance 3D Designer versions earlier than 14.1
- All supported platforms running vulnerable Substance 3D Designer builds
Discovery Timeline
- 2025-07-08 - CVE-2025-21165 published to the National Vulnerability Database
- 2025-07-11 - Last updated in NVD database
Technical Details for CVE-2025-21165
Vulnerability Analysis
The issue is classified under [CWE-787] Out-of-Bounds Write. Substance 3D Designer writes data past the boundary of an allocated buffer when parsing a malformed project or asset file. Attackers can leverage this memory corruption to overwrite adjacent structures, including function pointers or object metadata used by the application. Reliable exploitation chains the out-of-bounds write with control of program flow to execute attacker-supplied code.
The attack requires user interaction. The victim must open a file delivered through email, shared asset libraries, marketplace downloads, or collaboration platforms commonly used by 3D content creators.
Root Cause
The root cause is insufficient validation of size or index values when deserializing file contents into in-memory structures. The parser trusts attacker-controlled length or offset fields, then writes beyond the bounds of the destination buffer. Adobe has not publicly released the affected component, file format, or function names. Consult the Adobe Security Advisory APSB25-62 for vendor-supplied technical context.
Attack Vector
Exploitation is local and requires user interaction. An attacker crafts a malicious Substance 3D Designer file and delivers it to the target. When the user opens the file, parsing triggers the out-of-bounds write and executes shellcode in the user context. No elevated privileges are required to launch the attack, and the impact extends to confidentiality, integrity, and availability of the affected host.
No verified public proof-of-concept code is available. See the vendor advisory for technical details.
Detection Methods for CVE-2025-21165
Indicators of Compromise
- Unexpected child processes spawned from Substance 3D Designer.exe such as cmd.exe, powershell.exe, or rundll32.exe
- Substance 3D Designer process crashes or access violation events shortly after opening a third-party asset file
- Substance project files (.sbs, .sbsar) sourced from untrusted email attachments, chat platforms, or unofficial marketplaces
Detection Strategies
- Monitor for anomalous process lineage where Substance 3D Designer launches scripting interpreters or network utilities
- Hunt for file write or registry persistence activity originating from the Substance 3D Designer process
- Inspect endpoint telemetry for module loads of unexpected DLLs within the Substance 3D Designer process space
Monitoring Recommendations
- Enable EDR process and file telemetry for hosts running Adobe creative tooling
- Alert on inbound .sbs and .sbsar files from external senders at the email gateway
- Track Substance 3D Designer version inventory to identify hosts still running 14.1 or earlier
How to Mitigate CVE-2025-21165
Immediate Actions Required
- Upgrade Adobe Substance 3D Designer to the fixed version specified in Adobe Security Advisory APSB25-62
- Restrict opening of Substance 3D Designer files received from untrusted sources until patching is complete
- Audit endpoints to confirm all installations are on a non-vulnerable build
Patch Information
Adobe addressed CVE-2025-21165 in the update referenced by advisory APSB25-62. Apply the vendor-supplied build to every workstation running Substance 3D Designer. Review the Adobe Security Advisory APSB25-62 for exact fixed version numbers and download instructions.
Workarounds
- Block delivery of .sbs, .sbsar, and related Substance project files from external email senders
- Run Substance 3D Designer under a standard, non-administrative user account to limit blast radius
- Open untrusted 3D assets only inside isolated virtual machines without access to production data
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
