CVE-2025-6511 is a critical stack-based buffer overflow vulnerability identified in the Netgear EX6150 wireless range extender, specifically affecting firmware version 1.0.0.46_1.0.76. The vulnerability resides in the function sub_410090, where improper handling of input data allows an attacker to overwrite the stack memory. This flaw can be exploited remotely without requiring user interaction or authentication, making it highly dangerous. The buffer overflow can lead to arbitrary code execution, potentially allowing an attacker to take full control of the affected device. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits have been observed in the wild yet. Importantly, the affected product is no longer supported by Netgear, meaning no official patches or updates are available to remediate this issue. The CVSS v4.0 score is 8.7 (high severity), reflecting the vulnerability's ease of exploitation (network attack vector, low complexity, no privileges or user interaction required) and its high impact on confidentiality, integrity, and availability. The lack of vendor support significantly elevates the risk, as vulnerable devices remain exposed indefinitely unless mitigated by other means.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on the Netgear EX6150 devices in their network infrastructure. Compromise of these devices could allow attackers to intercept, manipulate, or disrupt network traffic, leading to data breaches, unauthorized access to internal networks, or denial of service conditions. Since the device is a wireless range extender, it often operates at network perimeters or extends wireless coverage, making it a strategic point for attackers to gain footholds or pivot into corporate networks. The absence of vendor support and patches means organizations must rely on alternative mitigations, increasing operational complexity and risk. Additionally, the public disclosure of the vulnerability may prompt threat actors to develop and deploy exploits targeting European networks, especially in sectors with high reliance on such networking hardware. The potential for widespread impact is compounded by the device's deployment in small and medium enterprises, home offices, and possibly branch offices, which may lack robust security monitoring.

Given the lack of official patches, European organizations should take immediate and specific actions to mitigate this vulnerability: 1) Identify all Netgear EX6150 devices running the affected firmware version within their networks using asset inventory and network scanning tools. 2) Where possible, decommission or replace these devices with supported hardware that receives regular security updates. 3) If replacement is not immediately feasible, isolate the vulnerable devices on segmented network zones with strict access controls to limit exposure. 4) Implement network-level protections such as intrusion detection/prevention systems (IDS/IPS) tuned to detect anomalous traffic patterns or exploit attempts targeting this vulnerability. 5) Monitor network traffic for signs of exploitation attempts, including unusual remote connections or crashes of the affected devices. 6) Educate IT staff about the vulnerability and ensure incident response plans include steps for potential exploitation scenarios. 7) Consider deploying additional endpoint and network security controls to detect lateral movement or data exfiltration that could result from device compromise.