Overview
A critical vulnerability, identified as CVE-2025-4832, has been discovered in TOTOLINK A702R, A3002R, and A3002RU 3.0.0-B20230809.1615 routers. This vulnerability resides in unknown code within the file /boafrm/formDosCfg of the HTTP POST Request Handler component. Exploitation of this vulnerability could lead to potential system compromise or data leakage, hence posing a serious threat to the security and integrity of data and systems that rely on these routers. The details of this exploit have been publicly disclosed, elevating the urgency for mitigation measures.
Vulnerability Summary
CVE ID: CVE-2025-4832
Severity: Critical – CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A702R | 3.0.0-B20230809.1615
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The vulnerability lies within the HTTP POST Request Handler component’s handling of the ‘submit-url’ argument, which can be manipulated to cause a buffer overflow. Buffer overflows occur when more data is written into a buffer than it can handle, causing the excess data to overflow into adjacent storage. In this case, an attacker could exploit this vulnerability by sending a specially crafted HTTP POST request containing a malicious ‘submit-url’ argument to the target system. This would allow them to execute arbitrary code or disrupt the operation of the system.
Conceptual Example Code
Below is a conceptual example of how an attacker might exploit this vulnerability:
POST /boafrm/formDosCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://attacker.example.com/very-long-string...In this example, the attacker sends an HTTP POST request to the vulnerable endpoint with a malicious ‘submit-url’. The ‘very-long-string’ exceeds the buffer’s capacity, causing an overflow.
It is strongly recommended that affected users apply the vendor-provided patch immediately or employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) for temporary mitigation.