CVE-2022-45519 is a high-severity stack overflow vulnerability identified in the Tenda W30E router firmware version V1.0.1.25(633). The vulnerability arises from improper handling of the 'Go' parameter in the /goform/SafeMacFilter endpoint. Specifically, the stack overflow (CWE-787) occurs when the input to this parameter exceeds expected bounds, leading to memory corruption on the device. This flaw can be exploited remotely over the network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The impact is primarily on availability, as successful exploitation can cause the device to crash or reboot, disrupting network connectivity. Although confidentiality and integrity impacts are not directly indicated, stack overflows can sometimes be leveraged for arbitrary code execution, but no such exploits are currently known in the wild for this vulnerability. The vulnerability affects a specific firmware version of the Tenda W30E, a consumer-grade wireless router. No official patches or vendor advisories have been linked yet, which suggests that affected devices may remain vulnerable if not updated or mitigated through other means.

For European organizations, especially small and medium enterprises or home office environments relying on Tenda W30E routers, this vulnerability poses a significant risk to network availability. A successful attack could lead to denial of service by crashing the router, causing loss of internet connectivity and disruption of business operations. While the direct impact on confidentiality and integrity is not established, the potential for further exploitation cannot be ruled out, which could escalate the threat. Given that many European organizations use consumer-grade networking equipment in less controlled environments, the risk of exploitation is heightened. Critical infrastructure or organizations with remote workforce setups using these routers may experience operational interruptions. Additionally, the lack of authentication requirement lowers the barrier for attackers, increasing the likelihood of opportunistic attacks. The absence of known exploits in the wild currently limits immediate widespread impact, but the vulnerability remains a concern until mitigated.

1. Immediate mitigation should involve isolating the Tenda W30E routers from untrusted networks, especially the internet-facing interfaces, to reduce exposure to remote exploitation. 2. Network administrators should implement strict firewall rules to block access to the /goform/SafeMacFilter endpoint or restrict HTTP management interfaces to trusted IP addresses only. 3. Monitoring network traffic for unusual requests targeting the /goform/SafeMacFilter path can help detect attempted exploitation. 4. Since no official patches are currently available, consider replacing vulnerable devices with routers from vendors that provide timely security updates. 5. If replacement is not feasible, disable remote management features on the router to prevent external access to vulnerable endpoints. 6. Regularly check for firmware updates from Tenda and apply them promptly once available. 7. Educate users about the risks of using outdated consumer-grade routers in business environments and encourage the adoption of enterprise-grade equipment with robust security support.