CVE-2024-32320 identifies a stack overflow vulnerability in the Tenda AC500 router firmware version V2.0.1.9(1307). The vulnerability arises from improper handling of the timeZone parameter within the formSetTimeZone function. Specifically, the function fails to properly validate or limit the size of input data, allowing an attacker to overflow the stack. This can cause the device to crash or reboot, resulting in a denial of service (DoS) condition. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, but the attack complexity is high, likely due to the need for precise input crafting. The vulnerability is categorized under CWE-121, which involves stack-based buffer overflows that can corrupt memory and disrupt normal execution flow. The CVSS v3.1 base score is 5.9, indicating a medium severity level. The vector string AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H shows that the attack is network-based, requires high complexity, no privileges or user interaction, and impacts availability only. No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed proactively. This vulnerability primarily threatens the availability of affected routers, potentially disrupting network connectivity for users relying on these devices.

The primary impact of CVE-2024-32320 is denial of service, which can cause affected Tenda AC500 routers to crash or reboot unexpectedly. This disrupts network availability for organizations and individuals relying on these devices for internet connectivity or internal networking. In environments where these routers serve critical roles, such as small to medium enterprises or home offices, this can lead to operational downtime and productivity loss. Although the vulnerability does not compromise confidentiality or integrity, the loss of availability can indirectly affect business continuity and user experience. The lack of authentication requirement means that attackers with network access can attempt exploitation, increasing risk in exposed network segments. However, the high attack complexity reduces the likelihood of widespread exploitation. No known exploits in the wild currently limit immediate risk, but the vulnerability remains a concern until patched. Organizations using Tenda AC500 routers should consider the potential for targeted DoS attacks, especially in regions with high deployment of these devices.

To mitigate CVE-2024-32320, organizations should first verify if they are using Tenda AC500 routers with firmware version V2.0.1.9(1307). Since no official patches are currently available, users should monitor Tenda’s official channels for firmware updates addressing this vulnerability. In the interim, network administrators should restrict access to router management interfaces by implementing network segmentation and firewall rules to limit exposure to untrusted networks. Disabling remote management or restricting it to trusted IP addresses can reduce attack surface. Additionally, monitoring router stability and logs for unexpected reboots or crashes can help detect potential exploitation attempts. Organizations should also consider deploying intrusion detection systems (IDS) or intrusion prevention systems (IPS) with signatures for anomalous traffic targeting router management functions. Finally, planning for timely firmware updates once patches are released is critical to fully remediate the vulnerability.