Overview
A recently discovered and publicly disclosed security vulnerability CVE-2025-7090 poses a significant risk to the users of Belkin F9K1122 1.00.33. This vulnerability, which is classified as critical, affects the function formConnectionSetting of the file /goform/formConnectionSetting of the webs component. It is of particular concern because it can lead to a system compromise or data leakage, and the exploit has been disclosed publicly and can be launched remotely. This blog post aims to provide a comprehensive overview of this vulnerability, its potential impact, and the recommended mitigation strategies.
Vulnerability Summary
CVE ID: CVE-2025-7090
Severity: Critical (CVSS 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: 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 lies in the manipulation of the argument max_Conn/timeOut in the function formConnectionSetting. This manipulation leads to a stack-based buffer overflow, an error condition where the program attempts to put more data in a buffer than it can hold. This overflow can overwrite adjacent memory locations and cause erratic program behavior, including memory access errors, incorrect results, program termination, or a breach of system security.
Conceptual Example Code
The following pseudocode illustrates a conceptual example of how the vulnerability might be exploited:
POST /goform/formConnectionSetting HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
max_Conn=timeOut&value=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the attacker sends an HTTP POST request with an oversized value for the max_Conn/timeOut argument, causing a buffer overflow.
Mitigation Guidance
Users are advised to apply the vendor patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. Note that these are not long-term solutions and do not fix the underlying vulnerability, but they can help protect against exploitation while a patch is developed. The vendor was contacted early about this disclosure but did not respond in any way, emphasizing the importance of implementing interim defensive measures.