Author: Ameeba

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.

Overview

The CVE-2025-4145 is a critical security vulnerability discovered in Netgear’s EX6200 1.0.3.94. This vulnerability pertains to a buffer overflow issue affecting the function sub_3D0BC. If successfully exploited, this vulnerability could potentially lead to system compromise or data leakage. Considering the widespread use of Netgear devices, this vulnerability could have serious implications for numerous network users, heightening the need for swift mitigation actions.

Vulnerability Summary

CVE ID: CVE-2025-4145
Severity: Critical (CVSS 8.8)
Attack Vector: Network
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 vulnerability stems from incorrect handling of the ‘host‘ argument within the ‘sub_3D0BC’ function. An attacker can exploit this vulnerability by sending a specially crafted request to manipulate the ‘host’ argument, causing a buffer overflow. This could potentially give the attacker control over the system or lead to unauthorized data access.

Conceptual Example Code

The following is a conceptual demonstration of how an attacker might exploit this vulnerability:

POST /sub_3D0BC/function HTTP/1.1
Host: vulnerable-host.com
Content-Type: application/json
{ "host": "A string long enough to cause a buffer overflow..." }

In this example, the ‘host’ argument is manipulated with an overly long string, causing a buffer overflow in the ‘sub_3D0BC’ function.

Mitigation Guidance

Due to the severity of the vulnerability, it is highly recommended for users to apply the vendor patch as soon as it is available. If the vendor patch is not available, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure to detect and block attempts to exploit this vulnerability. However, these measures are not a permanent solution and can only minimize the risk until a patch is applied.

Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a critical security vulnerability, CVE-2025-4141, found in the EX6200 version 1.0.3.94 of Netgear’s product range. This vulnerability affects the function sub_3C03C and can lead to a buffer overflow attack if exploited. The criticality of this vulnerability is highlighted by its high CVSS score of 8.8, indicating a serious threat to the integrity and security of systems running the affected software. It is of utmost importance for network administrators and cybersecurity professionals to understand this vulnerability, apply appropriate mitigations, and protect their systems.

Vulnerability Summary

CVE ID: CVE-2025-4141
Severity: Critical (8.8 CVSS score)
Attack Vector: Remote
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 in the affected Netgear product stems from an error in the ‘sub_3C03C’ function. Specifically, improper handling of the ‘host’ argument can cause a buffer overflow. In computer security and programming, a buffer overflow occurs when more data is put into a buffer or temporary data storage area than it can handle. This overflow can overwrite adjacent memory locations, potentially allowing an attacker to execute arbitrary code or cause a system crash.

Conceptual Example Code

The following is a conceptual example of how this exploit might be used in an attack. Note that this is a simplified representation and actual exploitation may require more sophisticated techniques.

POST /sub_3C03C/function HTTP/1.1
Host: target.example.com
Content-Length: [A value larger than the buffer size]
Content-Type: application/json
{ "host": "A string longer than the buffer size in the sub_3C03C function" }

In this example, the attacker sends a malicious HTTP POST request to the vulnerable function. The ‘host’ argument is filled with a string longer than the buffer size in the ‘sub_3C03C’ function, causing a buffer overflow.

Remediation

At the time of writing, the vendor has not yet provided a patch to address this vulnerability. As an interim measure, users are advised to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to mitigate the effects of potential exploits. However, these measures do not fully resolve the vulnerability, and users are strongly encouraged to apply the vendor’s patch once it becomes available.

Overview

The cybersecurity landscape is fraught with ever-evolving threats and vulnerabilities. One such vulnerability is CVE-2025-4140, a critical buffer overflow issue found in Netgear EX6120 1.0.3.94. This vulnerability, affecting the function sub_30394, has the potential to compromise the entire system or lead to significant data leakage. The seriousness of this vulnerability lies in the fact that the attack can be initiated remotely, posing a severe threat to systems worldwide. Despite the early disclosure to the vendor, no response or remediation measures have been provided yet.

Vulnerability Summary

CVE ID: CVE-2025-4140
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, potential data leakage

Affected Products

Product | Affected Versions

Netgear EX6120 | 1.0.3.94

How the Exploit Works

The vulnerability stems from the function sub_30394 in Netgear EX6120 1.0.3.94, which fails to properly handle certain arguments related to the host. An attacker can exploit this issue by sending manipulated host arguments, causing the system to overflow its buffer. This overflow can then enable an attacker to execute arbitrary code on the system, possibly leading to full system control or data leakage. The risk is compounded by the fact that the attack can be launched remotely, allowing attackers to exploit this vulnerability from anywhere in the world.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is not a real exploit, but a representation of how an HTTP request might be manipulated to trigger the buffer overflow.

POST /sub_30394/function HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"host": "<malicious_payload>"
}

In this example, “ represents a specially crafted string designed to overflow the buffer, leading to potential execution of arbitrary code or system compromise. It is crucial to patch this vulnerability as soon as possible or employ WAF/IDS as a temporary mitigation measure until the vendor responds with a proper fix.