CVE-2025-47758: Fujielectric Monitouch V-SFT Buffer Overflow

CVE-2025-47758 Overview

CVE-2025-47758 is a stack-based buffer overflow vulnerability in Fuji Electric V-SFT v6.2.5.0 and earlier. The flaw resides in the VS6File!CTxSubFile::get_ProgramFile_name function. Opening a specially crafted V7 or V8 project file triggers the overflow. Successful exploitation can cause application crash, information disclosure, or arbitrary code execution in the context of the current user.

V-SFT is engineering software used to configure Fuji Electric Monitouch human-machine interface (HMI) panels. The vulnerability requires local file access and user interaction, but no privileges are required to initiate the attack.

Critical Impact
Attackers can achieve arbitrary code execution on engineering workstations by tricking an operator into opening a malicious V7 or V8 file, potentially pivoting into industrial control environments.

Affected Products

Fuji Electric Monitouch V-SFT v6.2.5.0
Fuji Electric Monitouch V-SFT versions earlier than v6.2.5.0
V-SFT v6 installations parsing V7 or V8 project files

Discovery Timeline

2025-05-19 - CVE-2025-47758 published to NVD
2025-05-19 - Last updated in NVD database

Technical Details for CVE-2025-47758

Vulnerability Analysis

The vulnerability is classified as a stack-based buffer overflow [CWE-121] and out-of-bounds write [CWE-787]. The defect lives inside VS6File!CTxSubFile::get_ProgramFile_name, a routine that extracts a program file name from a parsed V7 or V8 project container. The function copies attacker-controlled data into a fixed-size stack buffer without enforcing destination bounds.

When a crafted file supplies an oversized name field, the copy operation overwrites adjacent stack memory. This corruption can clobber saved return addresses, structured exception handlers, or local variables used in subsequent control-flow decisions. The attacker can then redirect execution to attacker-supplied shellcode or to a ROP chain assembled from V-SFT modules.

Root Cause

The root cause is missing length validation before a stack copy in get_ProgramFile_name. The function trusts size fields embedded in the V7 or V8 file format and copies the name buffer directly onto the stack. There is no boundary check between the source length and the fixed destination buffer size.

Attack Vector

Exploitation requires local delivery of a malicious .V7 or .V8 file and user interaction to open it inside V-SFT v6. Common delivery channels include phishing emails with attached project files, shared engineering file repositories, and removable media used to transfer HMI configurations between workstations. No elevated privileges are required prior to exploitation, and successful code execution runs with the rights of the V-SFT user.

The vulnerability manifests during file parsing by the VS6File module. See the JVN Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-47758

Indicators of Compromise

Unexpected crashes of V-SFT.exe or the VS6File module recorded in Windows Application event logs with exception codes such as 0xC0000409 (stack buffer overrun) or 0xC0000005 (access violation).
.V7 or .V8 project files received from untrusted senders or originating outside the normal engineering change-control workflow.
Child processes spawned by V-SFT.exe such as cmd.exe, powershell.exe, or rundll32.exe shortly after a file open event.

Detection Strategies

Hunt for anomalous process lineage where V-SFT.exe is the parent of shell, scripting, or LOLBin processes.
Inspect .V7 and .V8 files for oversized program file name fields that exceed expected lengths defined by the V-SFT file format.
Correlate V-SFT crash telemetry with recent file open events to flag exploitation attempts that fail before achieving code execution.

Monitoring Recommendations

Enable Windows Error Reporting and forward V-SFT.exe crash dumps to a central analysis location.
Apply application allowlisting on engineering workstations to block unauthorized child processes of V-SFT.
Audit file shares and email gateways for .V7 and .V8 attachments and alert on unexpected senders.

How to Mitigate CVE-2025-47758

Immediate Actions Required

Restrict opening of V7 and V8 files in V-SFT v6 to files sourced from verified internal repositories only.
Isolate engineering workstations running V-SFT from general-purpose user networks and the internet where feasible.
Train HMI engineers to verify the origin of project files before opening them in V-SFT.

Patch Information

Fuji Electric distributes updated V-SFT v6 builds through the official download portal. Upgrade to a release later than v6.2.5.0 once available from the vendor. Refer to the Fuji Electric V-SFT Download Resource and the JVN Vulnerability Report for current version guidance.

Workarounds

Do not open V7 or V8 files received from untrusted or unverified sources.
Run V-SFT under a low-privilege Windows account to limit the impact of code execution.
Enable Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) system-wide to raise the cost of exploitation.
Segment HMI engineering workstations from operational technology (OT) production networks using firewalls and unidirectional gateways.

bash

# Example: enforce system-wide DEP and verify on Windows engineering workstation
bcdedit /set {current} nx AlwaysOn
wmic OS Get DataExecutionPrevention_SupportPolicy