Overview
The cybersecurity landscape is no stranger to vulnerabilities that can threaten the integrity of our digital systems. One such critical vulnerability, identified as CVE-2025-9393, has been discovered in several Linksys WiFi Extender models. This vulnerability is particularly concerning as Linksys is a commonly used brand in both domestic and corporate settings. This vulnerability in the Extenders could potentially allow an attacker to compromise the system or leak sensitive data, underscoring the criticality of addressing this issue swiftly and effectively.
With the exploitation of this vulnerability now public and the vendor’s lack of response, it becomes critical for users and administrators to understand the nature of this vulnerability, its implications, and the potential mitigation strategies that can be employed to safeguard against potential threats.
Vulnerability Summary
CVE ID: CVE-2025-9393
Severity: Critical, CVSS Score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or 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, 1.1.05.003, 1.2.07.001
Linksys RE6300 | 1.0.013.001, 1.0.04.001, 1.0.04.002, 1.1.05.003, 1.2.07.001
… and so on for other products
How the Exploit Works
The identified vulnerability resides in the addStaProfile function of the file /goform/addStaProfile. An attacker can exploit this vulnerability by sending a manipulated argument to the function. This manipulation can result in a stack-based buffer overflow, which can lead to unexpected behaviors including potential system crashes or, in worst-case scenarios, arbitrary code execution.
Conceptual Example Code
Here’s a conceptual example of a crafted HTTP request that might exploit this vulnerability:
POST /goform/addStaProfile HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
profile_name=VALID&ssid=VALID&wep_key_1=VALID&wep_key_2=VALID&wep_key_3=VALID&wep_key_4=BUFFER_OVERFLOW_PAYLOADIn this example, the “BUFFER_OVERFLOW_PAYLOAD” is a malicious payload designed to overflow the buffer and potentially allow the attacker to execute arbitrary code or crash the system.
Mitigation
Given the severity of this vulnerability and the lack of response from the vendor, it is recommended to apply any available vendor patches as soon as possible. In the absence of a vendor-supplied patch, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block or detect attempts to exploit this vulnerability can serve as a temporary mitigation strategy.