CVE-2025-47757: Exploitable Out-Of-Bounds Read Vulnerability in V-SFT v6.2.5.0 and Earlier

Overview

The vulnerability CVE-2025-47757 is a severe security flaw found in V-SFT v6.2.5.0 and earlier versions. This vulnerability arises due to an out-of-bounds read issue in the VS6MemInIF.dll!set_plc_type_default function. The flaw exposes users to the risk of a system crash, data leakage, and arbitrary code execution when opening specially crafted V7 or V8 files. Given the widespread use of the V-SFT software in different industries, including manufacturing and power distribution, it’s imperative for users and system administrators to understand and address this vulnerability promptly.

Vulnerability Summary

CVE ID: CVE-2025-47757
Severity: High – CVSS Score of 7.8
Attack Vector: Local
Privileges Required: Low
User Interaction: Required
Impact: Potential system crash, information disclosure, and arbitrary code execution

Affected Products

Product | Affected Versions

V-SFT | v6.2.5.0 and earlier

How the Exploit Works

The CVE-2025-47757 vulnerability occurs due to an out-of-bounds read error in the VS6MemInIF.dll!set_plc_type_default function. An attacker may craft V7 or V8 files, which when opened, trigger this error. This error then leads to undefined behavior, which might result in a system crash, information disclosure, or even arbitrary code execution under certain conditions. The code execution occurs in the context of the application and can lead to a full compromise of the affected system.

Conceptual Example Code

Imagine an attacker who crafts a malicious V8 file with specific data intended to trigger the out-of-bounds read error. The code might look something like this (note: this is a conceptual example and not actual exploit code):

#include <stdio.h>
#include <string.h>
int main() {
// The crafted V8 file data
char crafted_data[] = "specially crafted data triggering out-of-bounds read";
FILE *file;
file = fopen("malicious.v8", "w");
if (file != NULL) {
fwrite(crafted_data, sizeof(char), sizeof(crafted_data)-1, file);
fclose(file);
}
return 0;
}

This code creates a malicious V8 file that, when opened with a vulnerable version of V-SFT, would trigger the out-of-bounds read error, potentially leading to a system crash, information disclosure, or arbitrary code execution.

Mitigation

Users and administrators are advised to update their V-SFT software to the latest version to mitigate this vulnerability. If an update isn’t immediately possible, consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. These systems can help detect and prevent attempts to exploit this vulnerability, thereby protecting your system and data.