CVE-2025-47756: Out-of-Bounds Read Vulnerability in V-SFT v6.2.5.0 and Earlier

Overview

The cybersecurity world was recently stirred by the discovery of a new Common Vulnerabilities and Exposures (CVE) issue, CVE-2025-47756, a significant vulnerability found in V-SFT v6.2.5.0 and earlier versions. This vulnerability, if exploited, can lead to severe consequences such as system crashes, information disclosure, and even arbitrary code execution. This post aims to provide a detailed analysis of the vulnerability, discussing its potential impact, and providing suggestions on how to mitigate the risks associated with it.

Vulnerability Summary

CVE ID: CVE-2025-47756
Severity: High (CVSS: 7.8)
Attack Vector: Local
Privileges Required: Low
User Interaction: Required
Impact: 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 vulnerability stems from an out-of-bounds read issue in the VS6EditData!CGamenDataRom::set_mr400_strc function. The flaw is triggered when the software attempts to read data that exists outside the intended boundary of a buffer. This occurs when a user opens specially crafted V7 or V8 files, causing the software to read data beyond its allocated memory. This can lead to several undesirable outcomes, such as crashing the system, leaking sensitive information, or even allowing an attacker to execute arbitrary code.

Conceptual Example Code

Here is an example of how this vulnerability might be exploited. This pseudo-code represents a maliciously crafted file that causes an out-of-bounds read when opened:

#include <stdio.h>
#include <string.h>
int main() {
char buffer[10];
FILE *file = fopen("malicious.v7", "rb");
if (file == NULL) {
printf("Cannot open file \n");
return 1;
}
fread(buffer, sizeof(char), 15, file);
fclose(file);
printf("Buffer contains: %s\n", buffer);
return 0;
}

In this example, the program attempts to read 15 characters into a buffer that only has space for 10. This will result in an out-of-bounds read.

Mitigation Guidance

To mitigate the risks associated with this vulnerability, users of V-SFT v6.2.5.0 and earlier should apply the vendor’s patch as soon as it becomes available. This patch will correct the out-of-bounds read issue, thereby preventing potential exploits. In the meantime, users can use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) as temporary mitigation measures. These systems can help detect and block attempts to exploit the vulnerability.