CVE-2025-50609 is a high-severity buffer overflow vulnerability identified in the Netis WF2880 router, specifically in version 2.1.40207. The vulnerability exists within the Function_00465620 of the cgitest.cgi file. Attackers can exploit this flaw by manipulating the 'specify_parame' parameter in the HTTP request payload sent to the router's CGI interface. By carefully crafting this parameter's value, an attacker can trigger a buffer overflow condition, causing the program to crash. This results in a Denial of Service (DoS) condition, where the router becomes unresponsive or restarts, disrupting network connectivity. The vulnerability does not require any authentication or user interaction, and it can be exploited remotely over the network (AV:N), with low attack complexity (AC:L). The CVSS v3.1 base score is 7.5, reflecting a high severity primarily due to the impact on availability (A:H) without affecting confidentiality or integrity. The vulnerability is classified under CWE-120, which pertains to classic buffer overflow issues. No known exploits are currently reported in the wild, and no patches or mitigations have been officially released at the time of this report. Given the critical role of routers in network infrastructure, exploitation could lead to significant operational disruptions, especially in environments relying on Netis WF2880 devices.

For European organizations, this vulnerability poses a significant risk to network stability and availability. The Netis WF2880 router is commonly used in small to medium-sized enterprises and some residential settings across Europe. A successful exploitation could cause network outages, interrupting business operations, communications, and access to critical services. This is particularly impactful for organizations with limited IT support or those relying on these routers for remote office connectivity. Although the vulnerability does not compromise data confidentiality or integrity, the resulting denial of service could indirectly affect business continuity and service level agreements. Additionally, critical infrastructure sectors such as healthcare, finance, and public administration that depend on reliable network connectivity could face operational challenges. The lack of authentication and user interaction requirements makes this vulnerability easier to exploit remotely, increasing the risk of automated attacks or widespread scanning by threat actors targeting vulnerable devices in Europe.

Immediate mitigation steps include isolating affected Netis WF2880 devices from untrusted networks to reduce exposure. Network administrators should implement strict firewall rules to restrict access to the router's management interface, especially blocking external access to the cgitest.cgi endpoint. Monitoring network traffic for unusual or malformed HTTP requests targeting the router can help detect exploitation attempts. Since no official patches are currently available, organizations should consider temporary replacement or segmentation of vulnerable devices. Employing network segmentation to limit the impact of a compromised router and maintaining regular backups of router configurations can aid in rapid recovery. Additionally, organizations should subscribe to vendor advisories and CVE databases for updates on patches or firmware upgrades addressing this vulnerability. Implementing intrusion detection/prevention systems (IDS/IPS) with signatures targeting this specific exploit can provide proactive defense. Finally, educating IT staff about this vulnerability and encouraging prompt incident response readiness is crucial.