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CVE-2025-5902: Critical Buffer Overflow Vulnerability in TOTOLINK T10

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Overview

The cyber landscape is constantly evolving, with new vulnerabilities cropping up regularly. One such vulnerability that has become a cause of concern is the CVE-2025-5902, which affects TOTOLINK T10 routers. This critical flaw could potentially lead to system compromise or data leakage, affecting all users of the vulnerable router version. Given its severity and how widespread these routers are, it’s crucial to understand the nature of this vulnerability and how to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-5902
Severity: Critical, CVSS Score 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

TOTOLINK T10 | 4.1.8cu.5207

How the Exploit Works

The vulnerability lies within the setUpgradeFW function of the /cgi-bin/cstecgi.cgi file. Specifically, the issue arises from the manipulation of the “slaveIpList” argument, which leads to a buffer overflow. This buffer overflow may be exploited by a malicious actor to execute arbitrary code on the device, potentially leading to system compromise or data leakage. The exploit can be initiated remotely, meaning that an attacker doesn’t need physical access to the device to carry out the attack.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited:

POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"slaveIpList": "A string longer than the buffer that causes an overflow..."
}

In this example, the “slaveIpList” argument is filled with a string that’s longer than the buffer can handle, causing it to overflow. This overflow can then be used to execute arbitrary code.

Mitigation

The best way to protect your systems from this vulnerability is to apply the patch released by the vendor. If for some reason you are unable to apply the patch immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer some temporary mitigation. These systems can help detect and block attempts to exploit this vulnerability until the patch can be applied.
In the long term, it’s essential to keep your systems updated and patched against known vulnerabilities. Regular security audits can also help identify and mitigate potential vulnerabilities before they can be exploited.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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