Overview
A serious vulnerability has been identified in various models of Linksys routers that could allow an attacker to remotely compromise the system or leak data. This vulnerability affects a broad range of models, including the RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. It is a significant threat due to the widespread use of these devices and their role in securing home and business networks. This vulnerability demonstrates the importance of regular security updates and the potential risks of using unsupported devices.
Vulnerability Summary
CVE ID: CVE-2025-8832
Severity: High (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Linksys RE6250 | Up to 20250801
Linksys RE6300 | Up to 20250801
Linksys RE6350 | Up to 20250801
Linksys RE6500 | Up to 20250801
Linksys RE7000 | Up to 20250801
Linksys RE9000 | Up to 20250801
How the Exploit Works
The vulnerability is present in the setDMZ function of the /goform/setDMZ file. By manipulating the DMZIPAddress argument, an attacker can induce a stack-based buffer overflow. Buffer overflows are common vulnerabilities that occur when software writes more data to a buffer than it can hold. In this case, the overflow can overwrite other data structures, leading to unpredictable behavior, crashes, and in the worst case, execution of arbitrary code.
Conceptual Example Code
Here is a conceptual example of how this vulnerability might be exploited. This example uses a HTTP POST request to send a malicious payload to the vulnerable endpoint:
POST /goform/setDMZ HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
DMZIPAddress=192.168.1.1%00[buffer overflow data]In this example, the DMZIPAddress argument is set to a valid IP address followed by a null byte (%00) and additional data that overflows the buffer.
Mitigation Guidance
Users of affected devices are advised to apply the vendor patch, if available. If a patch is not available, users can mitigate the risk by deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) that can detect and block attempts to exploit this vulnerability. It is also recommended to contact the vendor for further guidance.