Overview
A critical vulnerability, identified as CVE-2025-6825, has been discovered in TOTOLINK A702R routers up to version 4.0.0-B20230721.1521. This flaw lies within an unspecified functionality of the file /boafrm/formWlSiteSurvey, which is part of the HTTP POST Request Handler component. The vulnerability is of significant concern as it can be exploited remotely and may compromise the entire system or result in data leakage. Given the widespread use of TOTOLINK routers, the potential impact of this vulnerability is immense and demands immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-6825
Severity: Critical, CVSS score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Possible system compromise and data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A702R | Up to version 4.0.0-B20230721.1521
How the Exploit Works
The exploit targets the argument ‘submit-url’ in the HTTP POST Request Handler component of the router’s firmware. By sending a specially crafted request, an attacker can manipulate this argument to trigger a buffer overflow. This overflow can subsequently lead to system instability, unauthorized access, or even remote command execution. The potential for remote exploitation coupled with the absence of any user interaction makes this a particularly dangerous vulnerability.
Conceptual Example Code
An attacker might exploit this vulnerability with a malicious HTTP POST request similar to the following:
POST /boafrm/formWlSiteSurvey HTTP/1.1
Host: vulnerable.router.com
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>In this example, `
Remediation
As a mitigation measure, users are advised to apply the vendor’s patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability. However, it is critical to note that these are temporary solutions and cannot fully eliminate the risks associated with this vulnerability. Regular patching and system updates remain the most effective defense against such threats.