Author: Ameeba

Overview

The CVE-2025-4149 is a critical vulnerability discovered in Netgear EX6200 version 1.0.3.94. The flaw exists in the function sub_54014 and can be exploited remotely by manipulating the argument ‘host’, which leads to a buffer overflow. This is a grave concern for users and administrators of the said product as it opens up the potential for system compromise and data leakage, posing significant threats to privacy and security.
Given the vendor’s lack of response to this disclosure, it is imperative that users are made aware of the vulnerability and its impacts. The severity score of 8.8 assigned to this vulnerability reflects its potential to inflict significant damage, and measures need to be taken to mitigate the risks.

Vulnerability Summary

CVE ID: CVE-2025-4149
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

Product | Affected Versions

Netgear EX6200 | 1.0.3.94

How the Exploit Works

The exploit works by manipulating the ‘host’ argument in the function sub_54014. This manipulation triggers a buffer overflow, which can allow an attacker to execute arbitrary code on the system or even gain control of the system. The attack can be initiated remotely over the network, requiring no user interaction and no special privileges, which makes it particularly dangerous.

Conceptual Example Code

The following is a conceptual example of how an attacker might exploit this vulnerability. This could be done by sending a specially crafted HTTP request to the target device:

POST /sub_54014 HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "host": "A long string that causes buffer overflow..." }

In the above example, the ‘host’ key in the JSON body is given a long string value that exceeds the buffer capacity, triggering an overflow.
Please note that this is a conceptual example and the actual exploitation would require specific knowledge of the system’s architecture and the vulnerable function’s implementation.

Overview

A critical vulnerability has been discovered in the Netgear EX6200, firmware version 1.0.3.94. This vulnerability has been identified and classified as CVE-2025-4148, presenting a severe risk to the integrity and security of affected systems. The issue resides within the `sub_503FC` function, where an incorrect handling of the ‘host’ argument may lead to buffer overflow. Due to the nature of this vulnerability, the potential for unauthorized remote access and execution of arbitrary code is a notable concern, posing a genuine risk to user data and system stability.

Vulnerability Summary

CVE ID: CVE-2025-4148
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Netgear EX6200 | 1.0.3.94

How the Exploit Works

The vulnerability originates from the `sub_503FC` function, specifically the manipulation of the ‘host’ argument. When this argument is handled incorrectly, it leads to a buffer overflow condition. This condition occurs when more data is written to a buffer than it can hold, causing the excess data to overflow into adjacent memory locations. This can corrupt data, crash the system, or lead to the execution of malicious code. In this case, the vulnerability can be exploited remotely, making it particularly dangerous.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. In this case, a malicious payload is sent to a vulnerable endpoint, which could cause a buffer overflow:

POST /vulnerable/sub_503FC HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "host": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..." }

In this example, “A” represents an arbitrary character, and the string length exceeds the buffer capacity, causing it to overflow. This is a simplified representation of an attack; a real-world exploit would likely involve carefully crafted input designed to execute malicious code or disrupt system operation.

Mitigation Guidelines

The ideal mitigation for this vulnerability would be to apply a vendor-supplied patch. However, as of the time of writing, the vendor has not responded to this disclosure. In the absence of a vendor patch, implementing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could serve as a temporary mitigation measure by monitoring and potentially blocking malicious traffic. Regular system and software updates, along with robust cybersecurity practices, are also essential in preventing successful exploits.

Overview

A critical vulnerability has been identified in Netgear EX6200 version 1.0.3.94, rated with a severity score of 8.8. This vulnerability, classified as a buffer overflow, has the potential to compromise systems or lead to data leakage. The exploit can be launched remotely, increasing its risk and potential impact. This vulnerability is a significant concern for all users of the affected Netgear product, as it could potentially allow malicious actors to gain unauthorized access to sensitive information, or even take control of the vulnerable systems.

Vulnerability Summary

CVE ID: CVE-2025-4147
Severity: Critical – CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

Netgear EX6200 | 1.0.3.94

How the Exploit Works

The CVE-2025-4147 vulnerability exists in the sub_47F7C function of Netgear EX6200 version 1.0.3.94. When the ‘host’ argument of this function is manipulated, it leads to a buffer overflow. This overflow can corrupt nearby space in memory and cause the application to crash or, potentially, allow an attacker to take control of the system. This vulnerability can be exploited remotely, and no user interaction is required, making it particularly dangerous.

Conceptual Example Code

In this conceptual example, an HTTP request is crafted to exploit the vulnerability:

POST /sub_47F7C/function HTTP/1.1
Host: vulnerable.netgear.com
Content-Type: application/json
{ "host": "A".repeat(10000) } // overflow the buffer

In the above example, the “host” argument is filled with a string of a length that exceeds the buffer limit, causing a buffer overflow.

Recommendations for Mitigation

The best course of action to mitigate this vulnerability is to apply the vendor-provided patch, when available. However, given the vendor’s lack of response to initial disclosure, it is advisable to use other means of mitigation. Implementing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary protection by detecting and blocking exploit attempts. Ensure these systems are properly configured to recognize and stop attacks that may exploit this vulnerability.
Regular penetration testing and vulnerability scanning are also crucial in identifying and rectifying such vulnerabilities promptly. Remember, cybersecurity is not a one-time event but rather a continuous process.

Overview

A critical vulnerability, identified as CVE-2025-4146, has been discovered in Netgear EX6200 firmware version 1.0.3.94. This vulnerability can potentially compromise the entire system or lead to data leakage if successfully exploited. The risk is particularly significant as it affects the sub_41940 function and can be launched remotely, posing a severe threat to all users of this firmware version.
This vulnerability matters tremendously because of its severity and the potential impact it could have on users’ data security. The vendor’s lack of response adds to the critical nature of the issue, leaving users vulnerable and without an official patch to mitigate the risk.

Vulnerability Summary

CVE ID: CVE-2025-4146
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Netgear EX6200 | 1.0.3.94

How the Exploit Works

The exploit works by manipulating the “host” argument in the sub_41940 function. This manipulation leads to a buffer overflow, which in turn could allow an attacker to execute arbitrary code or cause the system to crash. The vulnerability can be exploited remotely, and no specific user interaction or privileges are required to carry out the attack.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request exploiting the buffer overflow:

POST /sub_41940 HTTP/1.1
Host: vulnerable.netgear_device.com
Content-Type: application/x-www-form-urlencoded
host=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In the above example, the “host” parameter is filled with an excessively long string of “A” characters, causing a buffer overflow.

Mitigation Guidance

At the time of writing, the vendor has not released a patch. However, until a patch is available, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. These tools can help detect and block attempts to exploit this vulnerability. Users should also consider disabling remote management features if they are not required and always ensure that their systems and devices are behind firewalls.