CVE-2025-50611 is a buffer overflow vulnerability identified in the Netis WF2880 router firmware version 2.1.40207, specifically within the FUN_00473154 function of the cgitest.cgi file. The vulnerability arises when an attacker manipulates the values of the parameters wl_sec_set_5g and wl_sec_rp_set_5g in a crafted payload sent to the router's CGI interface. This improper handling of input data causes a buffer overflow, which can lead to the program crashing. The immediate consequence of this crash is a Denial of Service (DoS) condition, where legitimate users lose access to the router's web management interface or potentially network connectivity if the device becomes unresponsive. While the description does not explicitly confirm remote code execution, buffer overflows are often exploitable for such purposes, though this particular vulnerability is currently only confirmed to cause DoS. The vulnerability is triggered remotely via the web interface, likely without authentication, given the nature of CGI scripts handling network configuration parameters. No patches or fixes have been linked yet, and no known exploits are reported in the wild as of the publication date. The absence of a CVSS score indicates that the vulnerability is newly disclosed and not yet fully assessed for severity or impact scope.

For European organizations, the impact of this vulnerability primarily involves potential disruption of network infrastructure relying on Netis WF2880 routers. These routers are commonly used in small to medium-sized business environments and possibly in home office setups. A successful exploitation could cause network downtime due to router crashes, impacting business continuity, productivity, and potentially critical communications. In sectors where continuous network availability is essential—such as finance, healthcare, and manufacturing—this could translate into operational delays and financial losses. Although no remote code execution is confirmed, the risk of DoS alone can be significant, especially if attackers launch coordinated attacks against multiple devices. Additionally, if attackers develop exploits that extend beyond DoS, the confidentiality and integrity of network traffic could be at risk. European organizations using these devices without timely firmware updates or mitigations are vulnerable to service interruptions and potential escalation of attacks.

Organizations should immediately identify any Netis WF2880 routers in their network environment and verify the firmware version. Since no official patches are currently available, temporary mitigations include disabling remote management interfaces exposed to untrusted networks, especially the web-based CGI interface. Network segmentation should be enforced to isolate vulnerable devices from critical infrastructure. Implement strict firewall rules to block unauthorized access to router management ports from external sources. Monitoring network traffic for unusual requests targeting the cgitest.cgi endpoint can help detect exploitation attempts. Organizations should also subscribe to vendor advisories and CVE databases to apply firmware updates promptly once patches are released. In the interim, consider replacing vulnerable devices with models from vendors with a stronger security track record or that provide timely updates. Regular backups of router configurations and network plans will aid rapid recovery in case of device failure.