CVE-2022-45516 is a high-severity stack overflow vulnerability identified in the Tenda W30E router firmware version 1.0.1.25(633). The flaw exists in the handling of the 'page' parameter within the /goform/NatStaticSetting endpoint. Specifically, improper input validation allows an attacker to craft a malicious request that triggers a stack buffer overflow, potentially leading to denial of service (DoS) conditions by crashing the device or enabling further exploitation such as arbitrary code execution. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). Although the CVSS score is 7.5 (high), the impact is primarily on availability (A:H) with no direct confidentiality or integrity impact reported. The vulnerability is classified under CWE-787 (Out-of-bounds Write), which typically involves writing data outside the bounds of allocated memory, often leading to memory corruption. No public exploits have been reported in the wild to date, and no official patches or vendor advisories are currently available. The affected product is a consumer-grade router model, commonly used in home and small office environments. Given the nature of the vulnerability, exploitation could disrupt network connectivity, potentially impacting business operations relying on these devices for internet access or network routing functions.

For European organizations, especially small and medium enterprises (SMEs) and home office users relying on Tenda W30E routers, this vulnerability poses a significant risk to network availability. Successful exploitation could cause router crashes, resulting in loss of internet connectivity and disruption of critical business communications and services. While the vulnerability does not directly compromise confidentiality or integrity, the resulting denial of service could indirectly affect operational continuity. In sectors where continuous network uptime is critical, such as remote work environments, telemedicine, or financial services, this could lead to productivity losses and potential financial impact. Additionally, if attackers leverage this vulnerability as a foothold, it could be a stepping stone for further attacks within the network, although such scenarios are speculative without known exploits. The lack of authentication and user interaction requirements lowers the barrier for attackers, increasing the risk of automated exploitation attempts, especially in poorly secured or exposed network environments.

Immediately audit network environments to identify the presence of Tenda W30E routers, particularly version 1.0.1.25(633). Isolate affected devices from direct exposure to the internet by placing them behind firewalls or using network segmentation to limit access to the /goform/NatStaticSetting endpoint. Implement strict access control lists (ACLs) to restrict management interface access to trusted IP addresses only. Monitor network traffic for unusual or malformed HTTP requests targeting the /goform/NatStaticSetting path, which could indicate exploitation attempts. If possible, replace or upgrade affected devices to newer firmware versions once patches become available or consider alternative hardware with better security track records. Apply network-level intrusion detection/prevention systems (IDS/IPS) signatures to detect and block exploitation attempts targeting this vulnerability. Educate users and administrators about the risks of using outdated or unsupported router firmware and encourage regular firmware updates as a best practice. In the absence of vendor patches, consider deploying virtual patching techniques at the network perimeter to mitigate exploitation risks.