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CVE-2025-9245: High-Risk Buffer Overflow Vulnerability in Linksys Extenders

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Overview

A significant security vulnerability, CVE-2025-9245, has been identified in several models of Linksys Wi-Fi range extenders. The vulnerability resides in the function WPSSTAPINEnr of the file /goform/WPSSTAPINEnr and can potentially lead to a complete system compromise or data leakage. Given the widespread use of these devices, this vulnerability presents a substantial risk and requires immediate attention. This vulnerability is especially serious because it can be remotely exploited, and a working exploit is publicly available.

Vulnerability Summary

CVE ID: CVE-2025-9245
Severity: High (8.8 CVSS score)
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 | 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 arises from the manipulation of the ssid argument in the WPSSTAPINEnr function. This manipulation results in a stack-based buffer overflow, a common vulnerability that occurs when more data is written into a buffer than it can handle. This overflow can overwrite adjacent memory locations and potentially lead to arbitrary code execution. In this case, the vulnerability can be exploited remotely, meaning an attacker does not need physical access to the device.

Conceptual Example Code

This is a hypothetical code snippet showing how an attacker might exploit this vulnerability:

POST /goform/WPSSTAPINEnr HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "ssid": "AAAAA...[long string]...AAAAA" }

In this example, the ‘ssid’ argument is filled with a long string of ‘A’ characters, enough to overflow the stack buffer and potentially allow for the execution of malicious code.
It’s crucial to note that the vendor has not yet responded to this disclosure, making mitigation efforts even more critical. Affected users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary measure, and stay alert for any vendor-provided patches.

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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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