Overview
A critical vulnerability, CVE-2025-6953, has been identified in TOTOLINK A3002RU routers running firmware version 3.0.0-B20230809.1615. The vulnerability lies in an unknown function of the file /boafrm/formParentControl of the HTTP POST Request Handler. This flaw could lead to buffer overflow, making it possible for a remote attacker to potentially compromise the system and leak data. As router vulnerabilities often have wide-reaching consequences, this issue is of great concern to both individuals and organizations using the TOTOLINK A3002RU router.
Vulnerability Summary
CVE ID: CVE-2025-6953
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The vulnerability lies in the manipulation of the ‘submit-url’ argument in the HTTP POST Request Handler. A remote attacker can send a specially crafted HTTP POST request to the vulnerable endpoint, causing an overflow in the system buffer. This overflow can lead to arbitrary code execution, allowing the attacker to potentially gain control over the system.
Conceptual Example Code
Here’s a conceptual example of a malicious HTTP POST request that could be used to exploit this vulnerability:
POST /boafrm/formParentControl HTTP/1.1
Host: vulnerable.router.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://malicious.com&overflow_data=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIn this example, the ‘overflow_data’ parameter is filled with an excessive amount of data, which triggers the buffer overflow.
Mitigation Guidance
The best way to mitigate this vulnerability is to apply the vendor patch as soon as it is available. If the patch is not yet available or there are delays in its deployment, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can detect and block the malicious HTTP POST requests that attempt to exploit this vulnerability.