CVE-2025-7407 is a security vulnerability identified in the Netgear D6400 router, specifically in firmware version 1.0.0.114. The vulnerability resides in the diag.cgi component, where improper validation of the 'host_name' argument allows for OS command injection. This means that an attacker can remotely craft malicious input to execute arbitrary operating system commands on the affected device without requiring authentication or user interaction. The vulnerability is classified as medium severity with a CVSS 4.0 base score of 5.3, reflecting its remote exploitability and potential impact on confidentiality, integrity, and availability, albeit with some limitations. The vendor has acknowledged the issue promptly but the affected product is no longer supported, and no official patches are available. Although no known exploits are currently observed in the wild, public disclosure of the exploit code increases the risk of exploitation. The vulnerability could allow attackers to gain control over the device, potentially leading to network compromise, data interception, or use of the router as a pivot point for further attacks within the network.

For European organizations using the Netgear D6400 router, this vulnerability poses a tangible risk. Exploitation could lead to unauthorized control over network infrastructure, enabling attackers to intercept sensitive communications, disrupt network availability, or launch attacks against internal systems. Given that the device is no longer supported, organizations cannot rely on vendor patches, increasing exposure. This is particularly concerning for small and medium enterprises or home office setups that may still use legacy equipment. The impact extends to potential regulatory compliance issues under GDPR if personal data confidentiality is compromised. Additionally, compromised routers could be leveraged in botnets or for lateral movement, amplifying the threat landscape within European networks.

Since the Netgear D6400 is no longer supported and no patches are available, organizations should prioritize replacing affected devices with currently supported hardware that receives regular security updates. In the interim, network administrators should isolate these routers from critical network segments and restrict remote management access, ideally disabling remote administration entirely. Implementing network-level controls such as firewall rules to block external access to the router’s management interfaces can reduce exposure. Monitoring network traffic for unusual activity originating from these devices can help detect exploitation attempts. Employing network segmentation and strict access controls will limit the potential impact if a device is compromised. Finally, organizations should maintain an inventory of all network devices to identify and remediate unsupported hardware promptly.