Overview
A critical vulnerability has been discovered in TOTOLINK X15 1.0.0-B20230714.1105, a widely used router firmware version. This vulnerability, classified as CVE-2025-5736, is of significant concern as it allows the remote execution of buffer overflow attacks. Buffer overflow attacks can lead to severe consequences, including system compromise and potential data leakage, if not addressed promptly. Therefore, understanding this vulnerability, its effects, and how to mitigate it is crucial for all users and administrators of TOTOLINK X15.
Vulnerability Summary
CVE ID: CVE-2025-5736
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and 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
TOTOLINK X15 | 1.0.0-B20230714.1105
How the Exploit Works
The vulnerability resides in an unknown function of the file /boafrm/formNtp, part of the HTTP POST Request Handler. Specifically, the manipulation of the ‘submit-url’ argument can trigger a buffer overflow. In a buffer overflow attack, a hacker sends more data to a buffer than it can handle, which overflows the buffer’s boundary and overwrites adjacent memory. This can lead to unexpected behavior, including erroneous data, a crash, or a breach of system security.
Conceptual Example Code
The following is a conceptual example demonstrating how this vulnerability could be exploited. The attacker sends an HTTP POST request to the target with an oversized ‘submit-url’ argument, causing the buffer overflow:
POST /boafrm/formNtp HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://[oversized_data]Mitigation
Users and administrators of TOTOLINK X15 1.0.0-B20230714.1105 are advised to apply the vendor patch as soon as possible to mitigate this critical vulnerability. If the patch cannot be applied immediately, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These systems can help detect and block attacks that attempt to exploit this vulnerability.