CVE-2025-15357 is a command injection vulnerability identified in the D-Link DI-7400G+ router running firmware version 19.12.25A1. The vulnerability resides in an unknown function accessed via the /msp_info.htm endpoint, specifically through the 'cmd' parameter. Improper input validation allows remote attackers to inject arbitrary OS commands, which the device executes with elevated privileges. The attack vector is network-based and does not require authentication or user interaction, increasing the risk of exploitation. The vulnerability could allow attackers to gain control over the router, manipulate network traffic, disrupt services, or use the device as a foothold for further attacks within the internal network. Although the CVSS 4.0 score is 5.3 (medium), the presence of a public exploit increases the urgency for mitigation. No patches have been officially released yet, and no active exploitation has been confirmed. The vulnerability affects only the specified firmware version, limiting the scope but still posing a risk to unpatched devices. The lack of authentication and user interaction requirements makes this vulnerability particularly dangerous in exposed network environments.

For European organizations, exploitation of this vulnerability could lead to significant operational disruptions and data breaches. Compromise of the D-Link DI-7400G+ routers could allow attackers to intercept or manipulate network traffic, degrade network availability, or establish persistent access to internal systems. This is especially critical for organizations relying on these routers as gateways or in perimeter security roles. The ability to execute arbitrary commands remotely without authentication increases the risk of widespread compromise if devices are exposed to the internet or poorly segmented networks. Sensitive sectors such as government, finance, and critical infrastructure in Europe could face espionage, data theft, or sabotage. The medium severity rating suggests moderate impact, but the ease of exploitation and public availability of exploits elevate the threat level. Additionally, the vulnerability could be leveraged in botnet campaigns or lateral movement within corporate networks, amplifying its impact.

Immediate mitigation steps include restricting access to the router’s management interface, especially the /msp_info.htm endpoint, by implementing network-level controls such as firewall rules or VPN-only access. Organizations should monitor network traffic for suspicious requests targeting the 'cmd' parameter. Since no official patches are currently available, users should consider temporary device replacement or firmware rollback if a previous secure version exists. Vendors and users must prioritize firmware updates once released by D-Link. Network segmentation should be enforced to isolate vulnerable devices from critical assets. Employing intrusion detection systems (IDS) with signatures for command injection attempts can help detect exploitation attempts. Regular audits of device firmware versions and configurations are essential to identify and remediate vulnerable devices promptly. Finally, educating IT staff about this vulnerability and ensuring incident response plans include scenarios involving router compromise will improve preparedness.