Overview
We’re diving into the details of a critical SQL Injection vulnerability identified as CVE-2025-6918. This flaw is found in Ncvav’s Virtual PBX Software, a widely used system in many organizations for their telecommunication needs. The risk this vulnerability presents is significant, as it opens up potential for system compromise and data leakage, which could lead to devastating consequences for any business.
The importance of understanding and mitigating this vulnerability cannot be overstated. According to the Common Vulnerability Scoring System (CVSS), it has a Severity Score of 9.8, indicating its critical nature. In the cybersecurity world, anything above 7 is considered high risk, so this score tells us that immediate attention and action are required.
Vulnerability Summary
CVE ID: CVE-2025-6918
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Virtual PBX Software | Before 09.07.2025
How the Exploit Works
The vulnerability stems from the software’s improper neutralization of special elements used in an SQL command. This failure allows an attacker to manipulate SQL queries in the software’s database by injecting malicious SQL code. The attacker can then potentially gain unauthorized access to sensitive data or even execute commands in the system. Given the nature of PBX systems, this could compromise sensitive information like call records, voicemails, or even system configurations.
Conceptual Example Code
Below is a
conceptual
example of how the vulnerability might be exploited. This could be a malicious SQL command hidden within a seemingly harmless request to the system.
POST /pbx/api/request HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=admin&password=123456' OR '1'='1'; --In the above example, the attacker is attempting to log in with a username of “admin” and a password that includes an SQL injection. The “‘ OR ‘1’=’1′; –” portion of the command is the SQL injection, which will always evaluate to true, potentially granting the attacker unauthorized access.
How to Mitigate CVE-2025-6918
The most effective way to mitigate this vulnerability is to apply the vendor’s patch. Ncvav has already released a patch for this critical issue for versions of Virtual PBX Software from 09.07.2025 onwards.
In cases where immediate patching is not feasible, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. These systems can help by detecting and blocking SQL Injection attempts. However, they should not be used as a long-term solution in place of patching the system. Regular updates and patches are essential for maintaining a secure cybersecurity infrastructure.