CVE-2022-45523 is a high-severity stack overflow vulnerability identified in the Tenda W30E router firmware version 1.0.1.25(633). The vulnerability arises from improper handling of the 'page' parameter in the /goform/L7Im endpoint. Specifically, the stack overflow (CWE-787) occurs when an attacker sends a specially crafted request with an excessively long or malformed 'page' parameter, causing the device's stack memory to be overwritten. This can lead to unpredictable behavior, including crashes or potential execution of arbitrary code. The vulnerability is remotely exploitable over the network without requiring any authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The impact primarily affects availability (A:H), with no direct confidentiality or integrity impact reported. No known exploits are currently in the wild, and no official patches have been linked or published yet. The Tenda W30E is a consumer-grade wireless router, and such vulnerabilities can be leveraged to disrupt network connectivity or potentially pivot to further attacks within a compromised network environment. The lack of vendor or product details beyond the model and firmware version limits the scope of detailed technical mitigation but highlights the critical nature of input validation failures in embedded network devices.

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. Exploitation could lead to denial of service conditions, disrupting internet connectivity and potentially impacting business operations dependent on continuous network access. While the vulnerability does not directly compromise confidentiality or integrity, the resulting device instability could be exploited as a foothold for lateral movement or further attacks within internal networks. Given the router’s role as a network gateway, successful exploitation may also expose internal systems to external threats. The absence of authentication requirements increases the attack surface, allowing remote attackers to target vulnerable devices over the internet or local networks. The impact is particularly critical for organizations with limited IT security resources or those that have not segmented their networks adequately.

1. Immediate mitigation should include isolating Tenda W30E devices from direct internet exposure by placing them behind additional firewall layers or using network segmentation to limit access to the router’s management interfaces. 2. Network administrators should monitor network traffic for unusual requests targeting the /goform/L7Im endpoint, especially those containing suspiciously long or malformed 'page' parameters. 3. Disable remote management features on the router if enabled, reducing the attack surface. 4. Regularly audit and update router firmware; although no patch is currently available, maintain contact with Tenda for official updates or advisories. 5. Employ network intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect and block exploitation attempts targeting this vulnerability. 6. For organizations using Tenda W30E devices, consider replacing affected hardware with models from vendors with a stronger security track record if patches are delayed. 7. Educate users about the risks of using outdated or unsupported network equipment and encourage best practices for network device management.