Overview
The cybersecurity landscape continues to evolve at a rapid pace, with new vulnerabilities emerging on an almost daily basis. One such vulnerability that has been identified recently is CVE-2025-9252. This vulnerability affects multiple versions of Linksys range extenders and poses a serious threat to their security. If exploited, it can potentially lead to a complete system compromise or serious data leakage. This vulnerability is particularly concerning because it can be exploited remotely, and the exploit has already been made public.
Given its severity and the fact that the vendor has yet to respond to the vulnerability disclosure, it is crucial that users of the affected products apply appropriate mitigation measures to protect their systems. In this blog post, we will provide an in-depth analysis of this vulnerability, how it works, and how it can be mitigated.
Vulnerability Summary
CVE ID: CVE-2025-9252
Severity: Critical (CVSS v3 Score: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, 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 in the DisablePasswordAlertRedirect function in the /goform/DisablePasswordAlertRedirect file of the affected Linksys range extenders. By manipulating the ‘hint’ argument of this function, an attacker can trigger a stack-based buffer overflow. This overflow can overwrite critical system information, potentially leading to arbitrary code execution, and hence, system compromise.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is a hypothetical HTTP POST request to the vulnerable endpoint with a malicious payload.
POST /goform/DisablePasswordAlertRedirect HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "hint": "A"*1024 }In this example, the ‘hint’ argument is filled with a large number of ‘A’ characters, triggering a stack-based buffer overflow. Note that this is a simplified representation and actual exploit code may be more complex.
Recommended Mitigation
Until the vendor provides a patch, users of the affected Linksys devices are advised to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure to detect and block exploit attempts. These measures, however, are not a permanent solution, and users should apply the vendor patch as soon as it becomes available.