Overview
A critical vulnerability identified as CVE-2025-5861 has been discovered in Tenda AC7 15.03.06.44. This vulnerability specifically affects the function fromadvsetlanip of the file /goform/AdvSetLanip. It matters because the vulnerability, which arises from the manipulation of the argument lanMask, leads to a buffer overflow. This can potentially compromise the system or cause data leakage. Furthermore, the exploit can be initiated remotely and has already been disclosed to the public, which increases the likelihood of its misuse.
Vulnerability Summary
CVE ID: CVE-2025-5861
Severity: Critical, CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Tenda AC7 | 15.03.06.44
How the Exploit Works
The exploit works by manipulating the argument lanMask that is part of the fromadvsetlanip function in the /goform/AdvSetLanip file. This manipulation leads to a buffer overflow, which in computing terms means that more data is put into a buffer than it can handle. This overflow can overwrite adjacent memory locations, potentially leading to erratic program behavior, system crashes, or a breach of system security.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited:
POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "lanMask": "256.256.256.256" } // This is an invalid IP address used to trigger buffer overflowIn this example, an invalid IP address is used as the lanMask argument to trigger the buffer overflow. It’s important to note that this is a simplified representation and the real-world exploit might require more complex manipulation.
Mitigation and Remediation
The best way to mitigate this vulnerability is to apply the vendor patch. If the patch is not available or cannot be applied immediately, a temporary mitigation could be to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor traffic and block any suspicious activity related to this exploit. Regularly updating and patching your systems and software is a good general practice to reduce the risk of such vulnerabilities.