CVE-2025-47755 Overview
CVE-2025-47755 is an out-of-bounds read vulnerability in Fuji Electric V-SFT v6.2.5.0 and earlier. The flaw resides in the VS6EditData!VS4_SaveEnvFile function and is triggered when the application parses specially crafted V7 or V8 project files. Successful exploitation can lead to application crash, disclosure of process memory, or arbitrary code execution in the context of the user running V-SFT. The weakness is tracked under CWE-125 and affects engineering workstations used to develop human-machine interface (HMI) screens for Monitouch operator panels.
Critical Impact
Opening a malicious V7 or V8 file in V-SFT v6 can crash the process, leak memory contents, or execute attacker-controlled code on the engineering workstation.
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 project files in V7 and V8 formats
Discovery Timeline
- 2025-05-19 - CVE-2025-47755 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-47755
Vulnerability Analysis
The vulnerability is an out-of-bounds read within the VS6EditData!VS4_SaveEnvFile routine of V-SFT v6. When the application processes a V7 or V8 project file, the function reads data beyond the bounds of an allocated buffer. The read operation occurs during file parsing, before the data is committed back to disk during the save-environment workflow.
Because the out-of-bounds read happens against attacker-controlled file structures, the parser dereferences memory the caller does not own. Depending on the surrounding memory layout, this can leak adjacent heap or stack contents, corrupt control data used later in execution, or branch to attacker-influenced pointers. The vendor states that exploitation can result in crash, information disclosure, and arbitrary code execution.
The attack vector is local: an attacker must deliver a malicious project file and the operator must open it in V-SFT. This is consistent with engineering-workstation threat models in operational technology (OT) environments, where project files are exchanged by email, USB media, or shared network drives.
Root Cause
The root cause is missing or insufficient bounds validation on length fields parsed from V7 and V8 file structures inside VS4_SaveEnvFile. The function trusts size or offset values supplied by the file without verifying them against the allocated buffer size before performing the read.
Attack Vector
An attacker crafts a V7 or V8 file containing malformed size or offset metadata. The file is delivered to an engineer who runs V-SFT v6.2.5.0 or earlier. When the engineer opens or saves the file, VS6EditData!VS4_SaveEnvFile reads outside the intended buffer, producing the conditions for crash, leak, or code execution.
No verified proof-of-concept code has been published. See the JVN Vulnerability Report for vendor-supplied technical details.
Detection Methods for CVE-2025-47755
Indicators of Compromise
- Unexpected crashes of V-SFT.exe with faulting module VS6EditData.dll referenced in Windows Error Reporting (WER) or Application event logs
- V7 or V8 project files originating from untrusted email attachments, removable media, or external file shares opened on engineering workstations
- Child processes spawned by V-SFT.exe such as cmd.exe, powershell.exe, or rundll32.exe shortly after a file open operation
Detection Strategies
- Hunt for process crash events where the faulting image is VS6EditData.dll or the faulting function resolves to VS4_SaveEnvFile
- Correlate V-SFT file-open telemetry with anomalous memory allocation patterns or access violations on the engineering host
- Inspect inbound V7 and V8 files for malformed length fields or structurally invalid headers using file-integrity tooling before they reach operator workstations
Monitoring Recommendations
- Enable Windows Defender Exploit Guard or equivalent exploit mitigation telemetry on hosts running V-SFT and forward crash events to a central log store
- Monitor file movement of .V7 and .V8 artifacts across the IT/OT boundary, including USB ingress to engineering stations
- Alert on V-SFT spawning interactive shells, script interpreters, or network-capable binaries, which is not expected during normal HMI development
How to Mitigate CVE-2025-47755
Immediate Actions Required
- Inventory all engineering workstations running Fuji Electric Monitouch V-SFT v6 and identify hosts at v6.2.5.0 or earlier
- Restrict opening of V7 and V8 project files to known, trusted sources and block delivery of these file types from external email
- Run V-SFT under a least-privilege user account to limit the impact of arbitrary code execution
- Isolate engineering workstations from general corporate traffic and apply network segmentation between the engineering zone and the OT process network
Patch Information
Fuji Electric distributes updated V-SFT installers through the official download portal. Apply the latest available release that supersedes v6.2.5.0 from the Fuji Electric Monitouch download site. Validate the installer hash before deployment and confirm the fixed version is reflected in the application About dialog after installation.
Workarounds
- Do not open V7 or V8 files received from unverified senders or removable media of unknown provenance
- Use application allow-listing to permit only signed, expected versions of V-SFT.exe and VS6EditData.dll to execute
- Store master project files on access-controlled repositories and reject files that fail structural validation
- Disable auto-open or shell-association behavior that launches V-SFT when a project file is double-clicked from an untrusted location
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
