Overview
The cybersecurity landscape is constantly evolving, with new vulnerabilities and exploits being discovered on a regular basis. One of the recent vulnerabilities that has come to light is CVE-2025-9525. This security flaw affects Linksys E1700 1.0.0.4.003, a widely used networking device, and poses a serious threat due to its severity and potential for remote execution.
This vulnerability matters as it can be exploited remotely, potentially leading to system compromise or data leakage. Given the widespread use of Linksys devices, this vulnerability could have a significant impact on a broad range of users and businesses. The vendor has been notified but has yet to respond, increasing the urgency for awareness and mitigation.
Vulnerability Summary
CVE ID: CVE-2025-9525
Severity: Critical (8.8 CVSS score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System Compromise, Potential Data Leakage
Affected Products
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Product | Affected Versions
Linksys E1700 | 1.0.0.4.003
How the Exploit Works
The CVE-2025-9525 exploit targets a flaw in the ‘setWan’ function found in the file ‘/goform/setWan’ of the Linksys E1700. The vulnerability is a stack-based buffer overflow that can be triggered by manipulating the ‘DeviceName/lanIp’ argument.
This allows a malicious actor to overflow the buffer with more data than it is designed to hold, causing the program to overwrite other important data in memory. In turn, this can lead to unexpected behavior, including program crashes, incorrect operations, and in some cases, the execution of arbitrary code.
Conceptual Example Code
Here is a conceptual example of how this vulnerability could be exploited:
POST /goform/setWan HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
DeviceName=OVERFLOWED_DATA&lanIp=1.1.1.1In this example, ‘OVERFLOWED_DATA’ represents a string of data that exceeds the buffer’s capacity, triggering the overflow.
How to Mitigate the Vulnerability
As of now, the vendor has not provided a patch for this vulnerability. In the meantime, users can mitigate the risk by implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These solutions can monitor and block suspicious activities, including attempts to exploit this vulnerability. However, these are temporary measures, and users should anticipate a patch from the vendor to fully resolve this security flaw.
