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CVE-2025-10385: Critical Buffer Overflow Vulnerability in Mercury KM08-708H GiGA WiFi Wave2 1.1

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a significant security vulnerability, CVE-2025-10385, within the Mercury KM08-708H GiGA WiFi Wave2 version 1.1. This vulnerability pertains to a buffer overflow issue that can be triggered through the manipulation of the ChgUserId argument in the file /goform/mcr_setSysAdm. This vulnerability is of particular concern due to its potential for remote exploitation. Considering the widespread use of Mercury’s WiFi systems, this vulnerability could affect many users and businesses.

Vulnerability Summary

CVE ID: CVE-2025-10385
Severity: High (8.8 CVSS)
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

Mercury KM08-708H GiGA WiFi Wave2 | 1.1

How the Exploit Works

The exploit takes advantage of a buffer overflow condition in the function sub_450B2C of the file /goform/mcr_setSysAdm. This condition is triggered when an attacker sends an unusually large ChgUserId argument, which the system doesn’t properly handle. This overflow can then potentially lead to arbitrary code execution, thereby compromising the system or leading to data leakage.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability using an HTTP POST request:

POST /goform/mcr_setSysAdm HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
ChgUserId=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the ChgUserId argument is filled with an excessively large string of “A”s. This string overflows the buffer, causing the system to behave unpredictably and possibly executing arbitrary code.

Mitigation and Patching

To mitigate this vulnerability, it is recommended that users apply the vendor-provided patch as soon as possible. If the patch is not immediately available or cannot be installed promptly, users may employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary countermeasure to prevent potential exploits.

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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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