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CVE-2025-25457: Buffer Overflow Vulnerability in Tenda AC10

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Overview

This report covers the details of CVE-2025-25457, a severe buffer overflow vulnerability found in Tenda AC10 V4.0si_V16.03.10.20. The vulnerability affects users of this product and could potentially lead to system compromise or data leakage if exploited. The severity of the vulnerability and its wide potential impact make it a critical issue that requires immediate attention.

Vulnerability Summary

CVE ID: CVE-2025-25457
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Tenda AC10 | V4.0si_V16.03.10.20

How the Exploit Works

The vulnerability resides in the AdvSetMacMtuWan function of the Tenda AC10 firmware. If manipulated, an attacker can induce a buffer overflow via cloneType2, which could allow arbitrary code execution or cause the system to crash. The attack can be initiated remotely over a network, without any user interaction, and requires only low-level privileges to execute.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited:

POST /AdvSetMacMtuWan HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
cloneType2={ "malicious_payload": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."}

In the above example, the attacker sends an excessively long string in the “malicious_payload”, causing a buffer overflow in the AdvSetMacMtuWan function.
It’s recommended that all users apply the patch provided by the vendor as soon as possible or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure until the patch can be applied.

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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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