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CVE-2025-9356: Linksys Range Extenders Vulnerable to Stack-based Buffer Overflow Attack

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Overview

The cybersecurity landscape is an ever-evolving battlefield. A vulnerability recently identified, dubbed CVE-2025-9356, has caused quite a stir and is a matter of concern for many. This critical vulnerability affects a range of Linksys extenders namely RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. These extenders are at risk of a stack-based buffer overflow, a serious threat that could allow remote attackers to execute arbitrary code, potentially compromising the system or leaking sensitive data.
This vulnerability matters because of the widespread use of these Linksys range extenders in home and business environments. Given the remote attack vector, malicious actors could exploit this vulnerability from anywhere in the world, increasing the risk and potential scale of the damage.

Vulnerability Summary

CVE ID: CVE-2025-9356
Severity: High (8.8/10)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

Linksys RE6250 | 1.0.013.001
Linksys RE6300 | 1.0.04.001
Linksys RE6350 | 1.0.04.002
Linksys RE6500 | 1.1.05.003
Linksys RE7000 | 1.2.07.001
Linksys RE9000 | 1.2.07.001

How the Exploit Works

The vulnerability lies within the function inboundFilterAdd of the file /goform/inboundFilterAdd. Manipulation of the argument ruleName can lead to a stack-based buffer overflow, a condition where the stack pointer exceeds the stack bound, allowing an attacker to control the execution of the system, possibly leading to system crash or execution of malicious code.

Conceptual Example Code

The following conceptual example illustrates a potential exploitation of this vulnerability. Note that this is a simplified representation, not an actual piece of exploit code.

POST /goform/inboundFilterAdd HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"ruleName": "A"*10000 // This payload overflows the buffer
}

In this example, the ruleName is overloaded with a string of ‘A’s, exceeding the buffer capacity. This could cause a buffer overflow, potentially allowing an attacker to execute arbitrary code.

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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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