CVE-2024-40417 identifies a stack-based buffer overflow vulnerability in the Tenda AX1806 router firmware version 1.0.0.1. The flaw exists in the formSetRebootTimer function located in the /goform/SetIpMacBind endpoint, where improper validation and manipulation of the argument list allow an attacker to overwrite the stack memory. This vulnerability is classified under CWE-121 (Stack-based Buffer Overflow). The vulnerability can be exploited remotely by an attacker on the adjacent network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:A/AC:L/PR:N/UI:N). The impact is primarily on availability (A:H), potentially causing the device to crash or reboot unexpectedly, leading to denial of service conditions. No confidentiality or integrity impacts are noted. Although no exploits have been observed in the wild and no patches have been released, the vulnerability poses a risk to network stability for affected devices. The lack of authentication requirement and ease of exploitation increase the urgency for mitigation. The vulnerability affects a widely deployed consumer-grade router model, which is commonly used in home and small office environments, increasing the potential attack surface.

The primary impact of CVE-2024-40417 is on the availability of affected Tenda AX1806 routers. Successful exploitation can cause the device to crash or reboot, resulting in denial of service for end users. This disruption can affect home users and small businesses relying on these routers for internet connectivity and local network access. While the vulnerability does not compromise confidentiality or integrity, the loss of network availability can have cascading effects, such as interrupting business operations, remote work, or IoT device connectivity. The absence of authentication requirements and the ability to exploit the vulnerability from an adjacent network increase the risk of exploitation in shared or public network environments. Organizations with large deployments of these routers or those in environments with untrusted adjacent networks face increased exposure. The lack of available patches means the vulnerability may persist until vendor remediation is released, prolonging the risk window.

To mitigate CVE-2024-40417, organizations and users should first monitor Tenda’s official channels for firmware updates addressing this vulnerability and apply patches promptly once available. Until a patch is released, network administrators should implement network segmentation to isolate vulnerable devices from untrusted or public networks, limiting attacker access to the adjacent network. Employing strict access control lists (ACLs) on local networks can reduce exposure to malicious actors. Disabling remote management features and restricting access to the /goform/SetIpMacBind endpoint, if configurable, can further reduce risk. Regularly auditing network devices for firmware versions and replacing outdated or unsupported hardware with more secure alternatives is recommended. Additionally, monitoring network traffic for unusual activity targeting router management interfaces can help detect exploitation attempts early. Educating users about the risks of connecting to untrusted networks and encouraging the use of VPNs can also reduce attack surface.