CVE-2025-43582: Adobe Substance 3D Viewer Buffer Overflow

CVE-2025-43582 Overview

CVE-2025-43582 is a heap-based buffer overflow vulnerability [CWE-122] affecting Adobe Substance 3D Viewer versions 0.22 and earlier. The flaw allows arbitrary code execution in the context of the current user when a victim opens a malicious file. The scope remains unchanged, meaning exploitation does not cross a security boundary beyond the user account. Adobe published the security advisory APSB25-54 to address this issue.

Critical Impact
Successful exploitation leads to arbitrary code execution with the privileges of the user running Adobe Substance 3D Viewer, enabling attackers to install malware, steal data, or pivot within the environment.

Affected Products

Adobe Substance 3D Viewer version 0.22
Adobe Substance 3D Viewer versions earlier than 0.22
Windows and macOS installations of Substance 3D Viewer

Discovery Timeline

2025-07-08 - CVE-2025-43582 published to NVD
2025-07-11 - Last updated in NVD database

Technical Details for CVE-2025-43582

Vulnerability Analysis

The vulnerability is a heap-based buffer overflow [CWE-122] in Adobe Substance 3D Viewer. The application improperly handles memory allocation when parsing data from a crafted 3D asset file. When the file is opened, the parser writes data beyond the bounds of an allocated heap buffer. Attackers can shape the overflow to corrupt adjacent heap metadata or function pointers. This corruption can redirect execution flow and produce arbitrary code execution under the user account that opened the file.

Exploitation requires user interaction. The attack vector is local, meaning the malicious file must reach the victim through email, web download, or shared storage. The Exploit Prediction Scoring System currently rates exploitation likelihood as low, and no public proof-of-concept exploit has been observed.

Root Cause

The root cause is insufficient bounds validation during file parsing. The application allocates a fixed-size heap buffer based on assumptions about input structure. A malformed file containing oversized or unexpected length fields causes the parser to write past the buffer boundary. Adobe has not published the specific component or file format involved beyond the advisory APSB25-54.

Attack Vector

An attacker crafts a malicious Substance 3D asset file containing payload data designed to trigger the heap overflow. The attacker delivers the file through phishing, malicious websites, or compromised asset repositories. When the victim opens the file in Substance 3D Viewer, the parser processes the malicious structure and overflows the heap buffer. The resulting memory corruption allows execution of attacker-controlled code in the user context.

No verified exploit code is publicly available. Refer to the Adobe Security Advisory APSB25-54 for vendor guidance.

Detection Methods for CVE-2025-43582

Indicators of Compromise

Unexpected child processes spawned by Adobe Substance 3D Viewer.exe such as command shells, scripting engines, or rundll32.exe
Substance 3D Viewer process accessing files or network endpoints outside its typical workflow paths
Crash reports or Windows Error Reporting events referencing heap corruption in the Substance 3D Viewer process
Inbound 3D asset files from untrusted sources opened shortly before suspicious endpoint activity

Detection Strategies

Monitor process lineage for Substance 3D Viewer spawning unexpected children, which often signals successful code execution after a parser exploit
Inspect endpoint telemetry for anomalous memory regions marked executable within the Substance 3D Viewer process
Correlate file open events on .sbsar, .sbs, and related 3D asset extensions with subsequent process creation or network beaconing

Monitoring Recommendations

Enable detailed process and file telemetry on workstations running Substance 3D Viewer, particularly creative and design teams
Alert on Substance 3D Viewer connecting to external IP addresses or making outbound HTTP/HTTPS requests outside Adobe update infrastructure
Review email and web gateways for 3D asset files originating from untrusted senders or domains

How to Mitigate CVE-2025-43582

Immediate Actions Required

Update Adobe Substance 3D Viewer to the version specified in Adobe Security Advisory APSB25-54
Inventory all endpoints running Substance 3D Viewer and prioritize patching for workstations that routinely process external 3D assets
Instruct users to avoid opening Substance 3D files received from untrusted sources until patching is complete

Patch Information

Adobe released a fixed version of Substance 3D Viewer alongside the APSB25-54 advisory on July 8, 2025. Administrators should download the updated installer from Adobe and deploy it through standard software distribution channels. Verify the installed version after deployment to confirm remediation.

Workarounds

Restrict execution of Substance 3D Viewer to users with a documented business need until the patch is applied
Block inbound 3D asset file types at email and web gateways from untrusted external sources
Run Substance 3D Viewer under a standard user account rather than an administrator account to limit post-exploitation impact
Apply application allowlisting policies to prevent unauthorized child processes from launching under Substance 3D Viewer

bash

# Verify installed Substance 3D Viewer version on Windows
Get-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*" | \
  Where-Object { $_.DisplayName -like "*Substance 3D Viewer*" } | \
  Select-Object DisplayName, DisplayVersion, Publisher