CVE-2022-45505 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 'cmdinput' parameter in the /goform/exeCommand endpoint. Specifically, the stack overflow (CWE-787) occurs when the input to this parameter exceeds the expected buffer size, leading to memory corruption. This flaw can be exploited remotely 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 vulnerability impacts availability (A:H) but does not affect confidentiality or integrity directly (C:N/I:N). Exploiting this flaw could allow an attacker to cause a denial of service (DoS) by crashing the device or potentially execute arbitrary code if further conditions are met, although no confirmed exploits are currently reported in the wild. The vulnerability affects a specific firmware version of the Tenda W30E, a consumer-grade wireless router. No official patches or vendor advisories are currently available, increasing the risk for unpatched devices. The vulnerability was published on December 8, 2022, and is tracked under CWE-787 (Out-of-bounds Write). Given the network-exposed nature of the vulnerable endpoint and the lack of required privileges, this vulnerability presents a significant risk to affected devices if exploited.

For European organizations, the primary impact of CVE-2022-45505 is the potential disruption of network connectivity and availability due to denial of service attacks targeting Tenda W30E routers. This can affect both small and medium enterprises (SMEs) and home office environments that rely on these routers for internet access and internal network connectivity. While the vulnerability does not directly compromise confidentiality or integrity, the loss of availability can interrupt business operations, remote work, and critical communications. In sectors where continuous network uptime is essential, such as healthcare, finance, or critical infrastructure, such disruptions could have cascading effects. Additionally, if an attacker manages to leverage the stack overflow for remote code execution, it could lead to device takeover, enabling further lateral movement or persistent access within a network. The absence of patches and the ease of exploitation (no authentication or user interaction required) increase the urgency for mitigation. The impact is more pronounced in environments where Tenda W30E devices are widely deployed and where network segmentation or monitoring is limited.

1. Immediate mitigation should focus on isolating affected Tenda W30E devices from untrusted networks, especially the internet, to reduce exposure. 2. Network administrators should implement strict firewall rules to block access to the /goform/exeCommand endpoint or restrict HTTP management interfaces to trusted IP addresses only. 3. Employ network segmentation to separate vulnerable devices from critical infrastructure and sensitive data environments. 4. Monitor network traffic for unusual or repeated requests to /goform/exeCommand that could indicate exploitation attempts. 5. Where possible, replace Tenda W30E routers with devices from vendors with active security support and patch management. 6. If replacement is not immediately feasible, consider deploying intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect exploitation attempts targeting this vulnerability. 7. Regularly audit network devices for firmware versions and maintain an inventory to quickly identify vulnerable units. 8. Engage with Tenda support channels to obtain firmware updates or security advisories and apply patches promptly once available. 9. Educate users and network administrators about the risks of exposing router management interfaces to the internet and enforce strong network security policies.