Author: Ameeba

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

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.

Overview

CVE-2025-10392 is a critical vulnerability discovered in Mercury KM08-708H GiGA WiFi Wave2 version 1.1.14. The vulnerability lies within an unidentified function of the HTTP Header Handler component. It is triggered by manipulating the ‘Host’ argument, resulting in a stack-based buffer overflow. This vulnerability is critical due to its potential for remote exploitation, which could lead to a system compromise or data leakage. Given the severity of the vulnerability and its potential impact on users, it’s imperative that organizations take immediate steps to mitigate this risk.

Vulnerability Summary

CVE ID: CVE-2025-10392
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Mercury KM08-708H GiGA WiFi Wave2 | 1.1.14

How the Exploit Works

The exploit takes advantage of a vulnerability in the HTTP Header Handler of Mercury KM08-708H GiGA WiFi Wave2. Specifically, it manipulates the ‘Host’ argument in a way that causes a stack-based buffer overflow. This overflow can potentially overwrite crucial system data or function pointers, which could result in arbitrary code execution. This could allow an attacker to remotely take over the system or cause data leakage.

Conceptual Example Code

A conceptual example of exploiting this vulnerability might look like this:

GET / HTTP/1.1
Host: target.example.com { A*60000 }

In this example, the ‘Host’ field is overloaded with a string of ‘A’ characters. If the length of this string exceeds the buffer size allocated for the ‘Host’ argument, it will cause a buffer overflow. In a real-world scenario, an attacker could replace the ‘A’ characters with malicious code to execute a successful exploit.

Mitigation Guidance

The best mitigation strategy is to apply the vendor patch as soon as it becomes available. Until then, organizations can use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation option. These tools can help detect and block attempts to exploit this vulnerability. Additionally, organizations should monitor their network traffic for any unusual activities or attempts to exploit this vulnerability.

Overview

CVE-2025-21042 is a severe cybersecurity vulnerability that poses a substantial risk to digital systems and data worldwide. It is found in the libimagecodec.quram.so software component, where an out-of-bounds write error could allow remote attackers to execute arbitrary code. In a world increasingly connected by the internet, such a vulnerability has the potential to impact a wide range of products and services that incorporate this component. This vulnerability is especially concerning because it can potentially lead to system compromise and data leakage, posing a significant threat to data privacy and integrity.

Vulnerability Summary

CVE ID: CVE-2025-21042
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Remote Code Execution, Possible system compromise and data leakage

Affected Products

Product | Affected Versions

libimagecodec.quram.so | Prior to SMR Apr-2025 Release 1

How the Exploit Works

The vulnerability lies in an out-of-bounds write error in the libimagecodec.quram.so component. In simple terms, an out-of-bounds write occurs when data is written past the end or before the beginning of an intended buffer, which can corrupt data, crash the program, or enable the execution of malicious code. In this case, a remote attacker could exploit this vulnerability by sending specially crafted data to the affected system. The improper handling of this data by libimagecodec.quram.so could allow the attacker to execute arbitrary code on the system, potentially leading to a full system compromise.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP request that might exploit this vulnerability. The actual exploit would depend on the specific use case and environment.

POST /exploit/cve-2025-21042 HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "overflow_data": "AAAAAAAAAAAAAAAAAAAAAAAAAA...[more overflow data]" }

In this example, the “overflow_data” is crafted to cause an out-of-bounds write in the libimagecodec.quram.so component. This could potentially overwrite critical data or code in memory, leading to arbitrary code execution.

Mitigation

The best way to mitigate this vulnerability is to apply the vendor’s patch for libimagecodec.quram.so as soon as possible. If immediate patching is not possible, temporary mitigation can be achieved by using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. However, these measures only provide temporary protection and do not remove the vulnerability from the affected system. Therefore, patching should be performed as soon as it is feasible.