Overview
A critical vulnerability, CVE-2025-6337, has been identified in TOTOLINK routers A3002R and A3002RU. This vulnerability affects an unknown function of the file /boafrm/formTmultiAP of the HTTP POST Request Handler component. Buffer overflow is triggered by the manipulation of the ‘submit-url’ argument which can potentially compromise the system or leak data. This vulnerability is particularly severe as it can be exploited remotely, and the exploit has already been disclosed to the public, increasing the risk of potential attacks.
Vulnerability Summary
CVE ID: CVE-2025-6337
Severity: Critical (8.8 CVSS Severity Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 4.0.0-B20230531.1404
How the Exploit Works
The vulnerability resides in the HTTP POST Request Handler component of the TOTOLINK routers. Specifically, an unknown function in the /boafrm/formTmultiAP file. The exploit occurs when a malicious actor manipulates the ‘submit-url’ argument in an HTTP POST request. This manipulation triggers a buffer overflow, which can lead to arbitrary code execution. This means that the attacker can run their own commands on the compromised device, potentially gaining full control over the system or leaking sensitive data.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP POST request that manipulates the ‘submit-url’ argument.
POST /boafrm/formTmultiAP HTTP/1.1
Host: target_router_ip
Content-Type: application/x-www-form-urlencoded
submit-url=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... [and so on]In this example, the ‘submit-url’ argument is filled with a long string of ‘A’ characters, causing a buffer overflow. This is only a conceptual example and the actual exploit may involve more complex and specific payloads.
Mitigation
The immediate recommended mitigation is to apply the vendor-provided patch. In cases where the patch cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation. However, these should not be considered long-term solutions as they may not fully protect against all potential exploits of this vulnerability.