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CVE-2025-9253: Stack-based Buffer Overflow on Linksys Wi-Fi Range Extenders Leading to Potential System Compromise

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Overview

A critical security vulnerability, designated as CVE-2025-9253, has been identified in a range of Linksys Wi-Fi range extenders. This issue has been found to affect RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 models with specific firmware versions. The vulnerability resides in the RP_doSpecifySiteSurvey function of the /goform/RP_doSpecifySiteSurvey file. An attacker can exploit this vulnerability and compromise the system or cause data leakage, posing significant risks for users.
The breach is particularly dangerous because the attack can be initiated remotely, and the exploit has been publicly disclosed. Despite being informed about this vulnerability, the vendor has remained silent, leaving the devices exposed to potential attacks.

Vulnerability Summary

CVE ID: CVE-2025-9253
Severity: High (8.8/10)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, data leakage

Affected Products

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Product | Affected Versions

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

How the Exploit Works

The vulnerability stems from the improper handling of the ‘ssidhex’ argument in the function RP_doSpecifySiteSurvey. When an attacker manipulates ‘ssidhex’ and sends an overly long argument, it overflows the stack-based buffer. This overflow can lead to arbitrary code execution, granting the attacker control over the system.

Conceptual Example Code

The following is a conceptual example of how an attacker might exploit the vulnerability. This is not a working exploit but an illustration of the vulnerability:

POST /goform/RP_doSpecifySiteSurvey HTTP/1.1
Host: target_linksys_device_ip
Content-Type: application/x-www-form-urlencoded
ssidhex=41414141...[A*5000]

In this example, the ‘ssidhex’ argument is filled with a large number of ‘A’ characters (41 in hexadecimal), causing a buffer overflow.

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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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