Overview
The critical vulnerability CVE-2025-7087 discovered in Belkin F9K1122 1.00.33 has raised serious concerns among cybersecurity professionals. This vulnerability has the potential to compromise the entire system or lead to data leakage, posing a significant risk to any user of the affected Belkin device. The vendor has been unresponsive to the disclosure of this vulnerability, highlighting the urgency for users to take appropriate protective measures.
Vulnerability Summary
CVE ID: CVE-2025-7087
Severity: Critical (CVSS: 8.8)
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
Belkin F9K1122 | 1.00.33
How the Exploit Works
The vulnerability resides in the function formL2TPSetup of the file /goform/formL2TPSetup under the webs component. The manipulation of the L2TPUserName argument results in a stack-based buffer overflow. This overflow can be exploited remotely, leading to uncontrolled changes in the memory, which could potentially compromise the entire system or lead to data leakage.
Conceptual Example Code
Here’s a conceptual example of how a malicious actor might exploit this vulnerability:
POST /goform/formL2TPSetup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
L2TPUserName=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIn this example, the L2TPUserName field is filled with an excessive number of “A” characters, triggering a stack overflow.
Mitigation Measures
Users are advised to apply vendor patches as soon as they become available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. Regular monitoring of network traffic for any unusual activities can also help in early detection of possible attacks.