CVE-2022-45518 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 'page' parameter in the HTTP request sent to the /goform/SetIpBind endpoint. Specifically, the lack of bounds checking on this parameter allows an attacker to overflow the stack memory, potentially leading to denial of service (DoS) conditions by crashing the device or enabling further exploitation such as remote 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). The CVSS score of 7.5 reflects a high impact on availability (A:H) but no direct impact on confidentiality or integrity. Although no known exploits have been reported in the wild, the presence of a stack overflow (CWE-787) in a network-facing service represents a significant risk, especially given the widespread deployment of Tenda routers in consumer and small business environments. The absence of vendor or product details beyond the model and firmware version limits the scope of detailed attribution but confirms the vulnerability affects a specific Tenda device firmware. No patches or mitigation links have been provided, indicating that affected users may still be vulnerable if firmware updates have not been released or applied.

For European organizations, the primary impact of CVE-2022-45518 lies in the potential disruption of network connectivity and availability. Tenda routers, including the W30E model, are commonly used in small office and home office (SOHO) environments, which are integral to many European SMEs and remote workers. Exploitation could lead to denial of service, interrupting internet access and internal network communications. While the vulnerability does not directly compromise confidentiality or integrity, the resulting downtime could affect business operations, especially for organizations relying on these routers for VPN or remote access. Additionally, a successful stack overflow could be leveraged as a foothold for further attacks if combined with other vulnerabilities or misconfigurations. Given the remote and unauthenticated nature of the exploit, attackers could scan for vulnerable devices across Europe and launch automated attacks, increasing the risk of widespread disruption. Critical infrastructure organizations using these devices in less-secure network segments may also face increased risk of operational impact.

Immediately identify and inventory all Tenda W30E routers within the network environment, focusing on firmware version V1.0.1.25(633). Check for official firmware updates or security advisories from Tenda addressing this vulnerability; if available, apply updates promptly. If no patch is available, restrict access to the router’s management interface by implementing network segmentation and firewall rules to limit HTTP access to trusted IP addresses only. Disable remote management features on the affected devices to reduce exposure to external attackers. Monitor network traffic for unusual HTTP requests targeting /goform/SetIpBind with anomalous 'page' parameters that could indicate exploitation attempts. Consider replacing vulnerable devices with alternative routers from vendors with active security support and patch management. Implement intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting stack overflow attempts or malformed HTTP requests targeting router management endpoints. Educate IT staff and users about the risks of using outdated firmware and the importance of timely updates and network hygiene.