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CVE-2025-8831: Critical Buffer Overflow Vulnerability in Linksys Wi-Fi Extenders

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Overview

The CVE-2025-8831 is a critical vulnerability found in a selection of Linksys Wi-Fi Extenders models. The vulnerability is located in the function remoteManagement of the file /goform/remoteManagement. The exploitation of this vulnerability can lead to a stack-based buffer overflow, compromising the system and potentially leading to data leakage. The significance of this vulnerability is further elevated by the fact that it can be attacked remotely, and the exploit has been publicly disclosed. Despite being notified of the vulnerability, the vendor has not responded with a patch or workaround.

Vulnerability Summary

CVE ID: CVE-2025-8831
Severity: Critical, CVSS Severity Score 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Linksys RE6250 | Up to 20250801
Linksys RE6300 | Up to 20250801
Linksys RE6350 | Up to 20250801
Linksys RE6500 | Up to 20250801
Linksys RE7000 | Up to 20250801
Linksys RE9000 | Up to 20250801

How the Exploit Works

The exploit works by manipulating the argument portNumber in the remoteManagement function of the file /goform/remoteManagement. This manipulation causes a stack-based buffer overflow which compromises the system. An attacker can initiate this exploit remotely, which increases its potential impact.

Conceptual Example Code

A conceptual example of this exploit could be an HTTP request like this:

POST /goform/remoteManagement HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
portNumber=65536  //This is a conceptual example and the actual malicious payload may vary

In this example, an excessively large portNumber is sent, which the system may not be prepared to handle, leading to a buffer overflow.

Mitigation Guidance

As the vendor has not provided a patch or workaround, it is highly recommended to apply a third-party patch if available or implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. Additionally, frequent monitoring and logging of the network activities can help detect any unusual activities early on.

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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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