CVE-2025-50613 is a high-severity buffer overflow vulnerability identified in the Netis WF2880 router firmware version 2.1.40207. The flaw exists in the function FUN_00475e1c within the cgitest.cgi file, which processes HTTP requests. Specifically, the vulnerability can be triggered by an attacker controlling the value of the parameter wds_key_wep in the CGI payload. By sending a specially crafted request with a malicious wds_key_wep value, an attacker can cause a buffer overflow, leading to a program crash and potentially a Denial of Service (DoS) condition. The vulnerability does not require any authentication or user interaction, and can be exploited remotely over the network (AV:N/AC:L/PR:N/UI:N). The impact is limited to availability, with no confidentiality or integrity compromise indicated. The vulnerability is classified under CWE-120 (Classic Buffer Overflow), which is a common and well-understood software weakness. Although no known exploits are currently reported in the wild, the ease of exploitation and the lack of required privileges make this a significant risk for affected devices. No patches or firmware updates have been published yet by the vendor, increasing the urgency for mitigation.

For European organizations, the impact of this vulnerability primarily concerns network availability and operational continuity. Netis WF2880 routers are commonly used in small to medium enterprise environments and home offices, meaning that organizations relying on these devices for internet connectivity or internal network routing could experience service disruptions if targeted. A successful exploit could cause routers to crash, resulting in loss of network connectivity and potential downtime for critical business operations. While the vulnerability does not allow data theft or manipulation, the resulting DoS could indirectly affect business processes, especially in sectors with high dependency on stable network infrastructure such as finance, healthcare, and manufacturing. Additionally, the lack of authentication requirements means that attackers can launch attacks from anywhere on the internet, increasing the threat surface. European organizations with remote or distributed offices using these routers are particularly vulnerable to such network outages.

Given the absence of an official patch, European organizations should implement immediate compensating controls. First, restrict access to the router's management interface by limiting exposure to the internet; management interfaces should be accessible only from trusted internal networks or via secure VPN connections. Network-level filtering should be applied to block suspicious or malformed HTTP requests targeting the cgitest.cgi endpoint, especially those containing the wds_key_wep parameter. Intrusion detection and prevention systems (IDS/IPS) should be configured to detect and block buffer overflow attack patterns against Netis routers. Organizations should monitor router logs for unusual crashes or restarts that may indicate exploitation attempts. Where possible, replace or upgrade affected Netis WF2880 devices to newer firmware versions once patches become available or consider alternative hardware with better security track records. Regular network segmentation and redundancy can help minimize the impact of router outages. Finally, maintain up-to-date asset inventories to quickly identify and remediate vulnerable devices.