CVE-2024-11794: Fujielectric Monitouch V-sft RCE Flaw

CVE-2024-11794 Overview

CVE-2024-11794 is an out-of-bounds write vulnerability in Fuji Electric Monitouch V-SFT, a configuration tool used to design human-machine interface (HMI) screens for industrial control environments. The flaw resides in the parser that processes V10 project files. Attackers can leverage the issue to execute arbitrary code in the context of the current process. Exploitation requires user interaction: a target must open a crafted V10 file or visit a malicious page that delivers one. The Zero Day Initiative tracks the issue as ZDI-CAN-24504 and published advisory ZDI-24-1620.

Critical Impact
A single malicious V10 file opened by an HMI engineer can yield arbitrary code execution on an engineering workstation, providing a foothold into operational technology (OT) environments.

Affected Products

Fuji Electric Monitouch V-SFT version 6.2.3.0
Monitouch V-SFT V10 file parser component
Engineering workstations running the V-SFT configuration tool

Discovery Timeline

2024-11-28 - CVE-2024-11794 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-11794

Vulnerability Analysis

The vulnerability is classified as an out-of-bounds write [CWE-787] within the V10 file parsing logic of Monitouch V-SFT. The parser reads attacker-controlled fields from the file and uses them to size or index write operations against a heap buffer. Because the values are not properly validated against the allocated buffer boundaries, a crafted V10 file causes the parser to write past the end of the buffer.

Writing outside allocated memory corrupts adjacent heap structures. Attackers can shape the corruption to overwrite function pointers, virtual table entries, or heap metadata, leading to control-flow hijack. Successful exploitation yields code execution in the security context of the user running V-SFT, typically an engineering account with access to HMI project files and downstream PLC assets.

Root Cause

The root cause is missing validation of user-supplied data during V10 file parsing. The parser trusts length or offset fields embedded in the file structure without confirming they remain within the bounds of the destination buffer. When those fields exceed the allocation, the write operation proceeds past the buffer end.

Attack Vector

Exploitation requires local user interaction. An attacker delivers a crafted V10 file through email, a shared drive, a supplier portal, or a malicious web page. When an HMI engineer opens the file in V-SFT, the parser processes the malicious structures and triggers the out-of-bounds write. No prior authentication to the target system is required beyond the victim's own session.

The vulnerability manifests inside the V10 file parser during buffer sizing and copy operations. Technical specifics of the affected routine are documented in the Zero Day Initiative Advisory ZDI-24-1620.

Detection Methods for CVE-2024-11794

Indicators of Compromise

V-SFT process (V-SFT.exe or related binaries) spawning unexpected child processes such as cmd.exe, powershell.exe, or rundll32.exe
Unexpected crashes or Windows Error Reporting entries referencing the V-SFT process shortly after a V10 file is opened
V10 project files arriving from untrusted sources such as external email attachments or unmanaged USB media
Outbound network connections initiated by the V-SFT process to non-vendor destinations

Detection Strategies

Alert on process-creation events where V-SFT is the parent of an interpreter or scripting host
Monitor engineering workstations for heap corruption crash signatures associated with the V-SFT parser
Inspect file transfers into OT engineering zones for .V10 and related project file extensions from external origins

Monitoring Recommendations

Forward endpoint telemetry from HMI engineering workstations into a centralized analytics platform for correlation
Baseline normal V-SFT parent/child process relationships and flag deviations
Track file writes and executions in directories where V-SFT stores or opens project files

How to Mitigate CVE-2024-11794

Immediate Actions Required

Restrict opening of V10 files to those obtained from trusted, verified sources within the engineering supply chain
Isolate HMI engineering workstations from general-purpose corporate networks and internet browsing
Apply the principle of least privilege to accounts that run V-SFT to limit blast radius after code execution
Review the Zero Day Initiative advisory for the latest vendor remediation guidance

Patch Information

At the time of publication, the NVD entry lists no vendor advisory URL. Fuji Electric Monitouch V-SFT version 6.2.3.0 is confirmed affected. Administrators should consult Fuji Electric directly for a fixed release and monitor the ZDI advisory for updates.

Workarounds

Block delivery of V10 project files from untrusted email senders and web downloads at the gateway
Require file review and integrity verification before opening V10 files in V-SFT
Run V-SFT under a standard user account rather than an administrator account to limit post-exploitation impact
Segment OT engineering hosts from IT networks to reduce exposure to phishing-delivered project files

bash

# Example: Block .V10 attachments at a mail gateway (illustrative policy syntax)
attachment.extension in ("v10", "V10") AND sender.domain NOT IN trusted_partner_list
  -> action: quarantine, notify_security_team