CVE-2025-47759: Fujielectric Monitouch V-sft Overflow Flaw

CVE-2025-47759 Overview

CVE-2025-47759 is a stack-based buffer overflow vulnerability in Fujielectric Monitouch V-SFT v6.2.5.0 and earlier. The flaw resides in the CV7BaseMap::WriteV7DataToRom function within the VS6ComFile module. Attackers can trigger the overflow by convincing a user to open a specially crafted V7 or V8 project file.

Successful exploitation may lead to application crash, information disclosure, or arbitrary code execution in the context of the user running V-SFT. V-SFT is configuration software for Monitouch human-machine interface (HMI) panels used in industrial control environments, making this a concern for operational technology (OT) workstations.

Critical Impact
Opening a malicious V7 or V8 file in V-SFT v6.2.5.0 or earlier can result in arbitrary code execution on the engineering workstation.

Affected Products

Fujielectric Monitouch V-SFT v6.2.5.0
Fujielectric Monitouch V-SFT versions prior to v6.2.5.0
Systems processing V7 or V8 project files via the VS6ComFile component

Discovery Timeline

2025-05-19 - CVE-2025-47759 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47759

Vulnerability Analysis

The vulnerability is a stack-based buffer overflow [CWE-121] combined with an out-of-bounds write [CWE-787]. The defect lives in the CV7BaseMap::WriteV7DataToRom function exported by VS6ComFile, a shared component used by V-SFT to serialize V7 ROM data structures.

When V-SFT parses a V7 or V8 file, fields from the file influence how data is written into a fixed-size stack buffer inside WriteV7DataToRom. Crafted size or offset values cause the function to write past the buffer boundary, corrupting adjacent stack memory including saved return addresses and structured exception handler records.

Because the attack vector is local and requires user interaction, exploitation typically relies on social engineering. An engineer opens a project file received over email, shared drives, or removable media, and the parser executes the attacker's payload with the user's privileges.

Root Cause

The root cause is missing or insufficient bounds checking on attacker-controlled length or index fields read from the V7 or V8 file before they are used to copy data into a stack-allocated buffer in CV7BaseMap::WriteV7DataToRom.

Attack Vector

The attacker crafts a malicious V7 or V8 file containing oversized or malformed map data. The file is delivered to an engineer or operator who opens it in V-SFT. Parsing triggers the overflow, allowing the attacker to overwrite stack memory and redirect execution to shellcode or a return-oriented programming chain.

No verified public proof-of-concept code is available for CVE-2025-47759. See the JVN Security Advisory for vendor-coordinated technical details.

Detection Methods for CVE-2025-47759

Indicators of Compromise

Unexpected crashes of V-SFT.exe or modules loading VS6ComFile.dll with access violation exceptions in the call stack referencing CV7BaseMap::WriteV7DataToRom.
V7 or V8 project files arriving from untrusted sources such as external email, USB media, or contractor file shares.
Child processes spawned by V-SFT.exe such as cmd.exe, powershell.exe, or rundll32.exe shortly after a file open event.
Outbound network connections originating from V-SFT.exe to unfamiliar destinations.

Detection Strategies

Hunt for process lineage where V-SFT.exe is the parent of interpreter or scripting binaries, which is uncommon for engineering software.
Inspect crash dumps and Windows Error Reporting telemetry for faults inside VS6ComFile modules referencing WriteV7DataToRom.
Use YARA or file-type inspection on shared drives to flag V7 or V8 files that exceed expected size ranges or contain anomalous header fields.

Monitoring Recommendations

Forward endpoint process, file, and crash telemetry from OT engineering workstations to a central data lake for correlation.
Alert on first-time execution of V-SFT.exe on hosts not classified as engineering workstations.
Track file ingress paths to engineering hosts and flag V7 or V8 files originating outside approved repositories.

How to Mitigate CVE-2025-47759

Immediate Actions Required

Identify all hosts running Fujielectric Monitouch V-SFT v6.2.5.0 or earlier and prioritize patching engineering workstations that handle externally sourced project files.
Restrict who can deliver V7 or V8 files to engineering workstations using application allowlisting, removable media controls, and email attachment filtering.
Run V-SFT under a standard user account rather than a local administrator to reduce the blast radius of successful exploitation.

Patch Information

Fuji Electric has published fixed versions and download instructions through the official portal. Review the Fujielectric Download Information page and the JVN Security Advisory for the current fixed release and upgrade guidance. Apply the vendor-supplied update to all V-SFT installations.

Workarounds

Only open V7 and V8 files from trusted, internally controlled sources until patches are deployed.
Segment engineering workstations from general-purpose corporate networks and the internet to limit delivery channels for malicious files.
Enable operating system mitigations such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) on hosts running V-SFT.

bash

# Example: list V-SFT installations and versions across Windows hosts via PowerShell
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like "*V-SFT*" } | Select-Object Name, Version, InstallDate