CVE-2025-47756 Overview
CVE-2025-47756 is an out-of-bounds read vulnerability in Fuji Electric Monitouch V-SFT v6.2.5.0 and earlier. The flaw resides in the VS6EditData!CGamenDataRom::set_mr400_strc function. Attackers can trigger the condition by convincing a user to open a specially crafted V7 or V8 project file. Successful exploitation may result in application crash, information disclosure, or arbitrary code execution within the context of the user. The issue is tracked under CWE-125: Out-of-Bounds Read and was published to NVD on May 19, 2025. Coordination details are available through the JVN Vulnerability Information advisory.
Critical Impact
Opening a malicious V7 or V8 file in V-SFT v6.2.5.0 or earlier can lead to arbitrary code execution on the engineering workstation.
Affected Products
- Fuji Electric Monitouch V-SFT v6.2.5.0
- Fuji Electric Monitouch V-SFT versions prior to v6.2.5.0
- V-SFT v6 project files in V7 and V8 formats
Discovery Timeline
- 2025-05-19 - CVE-2025-47756 published to NVD
- 2025-05-19 - Last updated in NVD database
Technical Details for CVE-2025-47756
Vulnerability Analysis
The vulnerability is an out-of-bounds read in the VS6EditData!CGamenDataRom::set_mr400_strc function within the V-SFT v6 engineering software. V-SFT is the configuration tool used to build screens and logic for Monitouch human-machine interface (HMI) devices. The parser processes V7 and V8 project file formats used by the tool. When a crafted file is supplied, the function reads memory beyond an allocated buffer boundary. Depending on the adjacent memory contents, the read can leak sensitive process data, corrupt control flow, or be combined with heap grooming to achieve arbitrary code execution. Exploitation requires the operator to open the malicious file locally, so the practical attack model resembles a client-side document attack against engineering workstations.
Root Cause
The root cause is missing or insufficient bounds validation in CGamenDataRom::set_mr400_strc when parsing structured fields from V7 and V8 files. The function trusts size or offset values supplied by the file, allowing a read past the end of the destination buffer. This is classified under CWE-125.
Attack Vector
The attack vector is local and requires user interaction. An attacker delivers a malicious V7 or V8 file through email, removable media, shared engineering repositories, or a compromised vendor portal. When an engineer opens the file in a vulnerable V-SFT v6 installation, the parser triggers the out-of-bounds read. No authentication to the host is required from the attacker, and no network exposure of the HMI itself is needed. Refer to the JVN advisory for vendor coordination details.
Detection Methods for CVE-2025-47756
Indicators of Compromise
- Unexpected crashes of the V-SFT v6 process when opening project files, particularly with fault offsets in VS6EditData.dll.
- Untrusted .V7 or .V8 project files arriving via email, removable media, or external file shares.
- Engineering workstations spawning unexpected child processes from the V-SFT v6 executable shortly after a file open.
Detection Strategies
- Inspect Windows Error Reporting and application crash dumps on engineering hosts for faults in the VS6EditData!CGamenDataRom::set_mr400_strc symbol.
- Hunt endpoint telemetry for V-SFT v6 process executions correlated with file opens from non-standard directories such as user Downloads or temporary folders.
- Apply file integrity monitoring to known-good V-SFT project repositories to flag introduction of unverified V7 or V8 files.
Monitoring Recommendations
- Forward process, file, and crash telemetry from operational technology (OT) engineering workstations to a centralized SIEM or data lake for correlation.
- Monitor for outbound network connections initiated by the V-SFT v6 process, which should normally not communicate externally.
- Alert on V-SFT child processes such as cmd.exe, powershell.exe, or rundll32.exe, which indicate post-exploitation activity.
How to Mitigate CVE-2025-47756
Immediate Actions Required
- Inventory all V-SFT v6 installations and identify versions at or below v6.2.5.0.
- Restrict opening of V7 and V8 project files to those originating from verified internal sources until patched builds are deployed.
- Isolate HMI engineering workstations from general-purpose user environments and email clients.
- Apply application allowlisting so that only signed, expected processes can execute on engineering hosts.
Patch Information
Fuji Electric publishes updated V-SFT v6 builds through its download portal. Operators should obtain the latest version from the Fujielectric Monitouch Download Guide and verify the installed version is greater than v6.2.5.0 before reopening untrusted project files. Reference the JVN Vulnerability Information advisory for coordinated guidance.
Workarounds
- Do not open V7 or V8 project files received from untrusted or unverified sources.
- Validate the origin and integrity of project files using out-of-band channels before importing them into V-SFT v6.
- Run V-SFT v6 under a least-privileged user account to limit the impact of arbitrary code execution.
- Disable or restrict access to removable media on engineering workstations.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
