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.
