Overview
The cybersecurity landscape is constantly evolving, and with it, the emergence of new threats and vulnerabilities. One such vulnerability, which has been classified as critical, has been discovered in multiple models of LB-LINK routers. This vulnerability, identified as CVE-2025-7574, affects the web interface component of these routers, leading to improper authentication. As a result, attackers can potentially launch remote attacks, leading to system compromise or data leakage.
The vulnerability has been publicly disclosed, increasing the risk of potential exploits. Despite early contact and disclosure to the vendor, there has been no response, raising serious concerns about the security of these devices and the data they protect. This vulnerability highlights the importance of maintaining up-to-date device software and the potential risks associated with using unsupported or outdated devices.
Vulnerability Summary
CVE ID: CVE-2025-7574
Severity: Critical (CVSS score 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
LB-LINK BL-AC1900 | Up to 20250702
LB-LINK BL-AC2100_AZ3 | Up to 20250702
LB-LINK BL-AC3600 | Up to 20250702
LB-LINK BL-AX1800 | Up to 20250702
LB-LINK BL-AX5400P | Up to 20250702
LB-LINK BL-WR9000 | Up to 20250702
How the Exploit Works
The vulnerability stems from a flaw in the ‘reboot/restore’ function of the ‘/cgi-bin/lighttpd.cgi’ file, which is a component of the web interface. This flaw allows for manipulation that leads to improper authentication. Since the vulnerability can be exploited remotely, an attacker doesn’t need physical access to the device, increasing the likelihood of potential attacks.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This example represents a simple HTTP POST request that might be used to manipulate the vulnerable ‘reboot/restore’ function.
POST /cgi-bin/lighttpd.cgi?reboot/restore HTTP/1.1
Host: vulnerable-router.example.com
Content-Type: application/json
{
"action": "reboot",
"auth_override": true
}In this hypothetical example, the “auth_override”: true part of the payload is the unauthorized command that takes advantage of the improper authentication. The real-life exploit could be more complex and require additional steps or information. Please note that this is a conceptual example and should not be used for any illicit activities.