Overview
A high-severity vulnerability, indexed as CVE-2025-9247, has been discovered in Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. This vulnerability stems from a flaw in the handling of the setVlan function, which can lead to a stack-based buffer overflow. This vulnerability is of notable concern, given the widespread use of Linksys routers and the potential for remote exploitation, leading to possible system compromise or data leakage.
The vulnerability was publicly disclosed, making it a more pressing issue for users and network administrators who utilize the affected devices. Despite early notification, the vendor has yet to provide a response or remedy, increasing the urgency of understanding and mitigating this threat.
Vulnerability Summary
CVE ID: CVE-2025-9247
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 | 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 | 1.0.013.001
How the Exploit Works
The vulnerability lies in the setVlan function of the /goform/setVlan file. The improper handling of the vlan_set argument allows for a buffer overflow condition. An attacker can manipulate the vlan_set argument to cause the stack-based buffer overflow, which could potentially lead to the execution of arbitrary code on the affected device.
Conceptual Example Code
The following conceptual code illustrates the manipulation of the vlan_set argument, causing the buffer overflow.
POST /goform/setVlan HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
vlan_set=OVERFLOW_DATAIn this example, OVERFLOW_DATA is a string longer than the buffer’s capacity, causing a buffer overflow. Please note that this is a conceptual example and the actual exploit may involve more intricate steps or manipulations.
Mitigation Guidance
Until a vendor patch is released, users can deploy a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as temporary mitigation measures. These systems should be configured to detect and block suspicious activities related to the setVlan function. Regularly monitor your network for any unusual activity and ensure all devices are kept up-to-date with the latest security patches and updates.