Overview
In the ever-evolving landscape of cybersecurity, a new high-risk vulnerability, CVE-2025-9251, has been discovered in a range of Linksys Wi-Fi extenders. This vulnerability impacts several Linksys models including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. It has been identified that this security flaw can be triggered remotely, thus raising a critical concern for users and network administrators. Given its high CVSS severity score, it is crucial to understand the extent of this vulnerability, the systems it affects, and the potential ways to mitigate this exploit.
Vulnerability Summary
CVE ID: CVE-2025-9251
Severity: High (CVSS: 8.8)
Attack Vector: Remote, Network Access
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
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 | 1.0.04.002
How the Exploit Works
The security flaw resides in the function ‘sta_wps_pin’ of the file ‘/goform/sta_wps_pin’. This function, when manipulated with an argument ‘ssid’, results in a stack-based buffer overflow. A buffer overflow is a type of software vulnerability that exists when the data written to a buffer exceeds its capacity, thus allowing an attacker to overwrite adjacent memory locations.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. Please note that this is a hypothetical scenario and does not represent a real exploit.
POST /goform/sta_wps_pin HTTP/1.1
Host: vulnerablelinksys.com
Content-Type: application/json
{ "Ssid": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..." }In the above example, the Ssid parameter is filled with a large number of ‘A’ characters, thereby causing a buffer overflow in the target system.
Mitigation
While it is evident that the vendor has yet to respond to this disclosure, it is strongly recommended that users apply vendor-provided patches as soon as they become available. In the meantime, users can implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. Regular monitoring of network traffic for any anomalies can also aid in detecting any potential attacks.
