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CVE-2025-25455: Critical Buffer Overflow Vulnerability in Tenda AC10 V4.0si

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Overview

CVE-2025-25455 represents a severe vulnerability in Tenda AC10 V4.0si_V16.03.10.20, a popular router hardware. This vulnerability is a Buffer Overflow in the AdvSetMacMtuWan via wanMTU2, potentially leading to system compromise or data leakage. Given the widespread use of this device in both commercial and personal applications, this vulnerability poses a significant risk that demands immediate attention.

Vulnerability Summary

CVE ID: CVE-2025-25455
Severity: High (CVSS score 7.5)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Tenda AC10 | V4.0si_V16.03.10.20

How the Exploit Works

The exploit leverages a buffer overflow vulnerability in the AdvSetMacMtuWan module of the Tenda AC10 V4.0si_V16.03.10.20. By sending a crafted input that exceeds the buffer’s capacity via wanMTU2, an attacker can overflow the buffer, leading to the execution of arbitrary code or causing the system to crash. This exploit can be executed remotely, making it a significant threat to all affected devices.

Conceptual Example Code

Consider the following conceptual exploitation of this vulnerability, where an attacker sends an excessively large payload to the vulnerable endpoint:

POST /AdvSetMacMtuWan/wanMTU2 HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "mtu_size": "OVERFLOW_PAYLOAD" }

This is not a literal payload but an illustrative example of how the buffer overflow vulnerability could be exploited. The exact malicious payload would likely be an oversized input designed to overflow the buffer and manipulate the system’s memory.

Mitigation Guidance

Affected users should apply the patch provided by the vendor as soon as possible. If a patch is not immediately available or applicable, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure. These tools can help detect and block attempts to exploit this vulnerability.

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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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