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CVE-2025-57638: Critical Buffer Overflow Vulnerability in Tenda AC9 1.0

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Overview

The vulnerability CVE-2025-57638 is a critical buffer overflow flaw in Tenda AC9 version 1.0, which could lead to potential system compromise or data leakage. This vulnerability is particularly concerning due to the widespread use of Tenda products in various sectors, making it an attractive target for malicious actors. The vulnerability stems from an improperly handled user-supplied sys.vendor configuration value.

Vulnerability Summary

CVE ID: CVE-2025-57638
Severity: Critical (CVSS: 7.5)
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

Tenda AC9 | 1.0

How the Exploit Works

This vulnerability is exploited when a user-supplied sys.vendor configuration value is improperly handled, triggering a buffer overflow. The overflow can overwrite adjacent memory locations, potentially allowing execution of arbitrary code or causing a system crash. This can lead to system compromise or data leakage if exploited successfully.

Conceptual Example Code

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

POST /sys.vendor/configure HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "sys.vendor": "OVERFLOW_STRING" }

In this example, the “OVERFLOW_STRING” would be manipulated to be larger than the buffer allocated for the sys.vendor value. When this request is processed by the Tenda AC9, it results in a buffer overflow, potentially leading to arbitrary code execution or a system crash.

Mitigation

Users are strongly advised to apply the latest vendor patch to mitigate this vulnerability. If a patch is not available, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. However, these measures do not completely remove the vulnerability and only provide protection against known exploit techniques.

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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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