CVE-2024-46424 identifies a buffer overflow vulnerability in the UploadCustomModule function of the TOTOLINK AC1200 T8 router firmware version 4.1.5cu.861_B20230220. This vulnerability stems from improper validation or bounds checking of the File parameter passed to the function, classified under CWE-120 (Classic Buffer Overflow). When exploited, an attacker can send a specially crafted request to the router’s management interface that triggers a buffer overflow, leading to a denial of service (DoS) condition by crashing or destabilizing the device. The vulnerability is remotely exploitable without any authentication or user interaction, increasing its risk profile. The CVSS v3.1 base score is 7.5, reflecting high severity due to network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact is limited to availability, with no direct confidentiality or integrity compromise reported. No patches or firmware updates have been published yet, and no active exploits have been observed in the wild. However, the vulnerability poses a significant risk to network stability, especially in environments where these routers are deployed as critical network gateways or access points.

The primary impact of CVE-2024-46424 is denial of service, which can disrupt network connectivity and availability for organizations using the affected TOTOLINK AC1200 T8 routers. This can lead to operational downtime, loss of productivity, and potential cascading effects on dependent systems and services. Since the vulnerability can be exploited remotely without authentication, attackers can cause widespread disruption without needing internal network access. This is particularly concerning for enterprises, ISPs, and critical infrastructure providers relying on these routers for stable internet access. Although no data confidentiality or integrity compromise is indicated, the loss of availability can severely affect business continuity and user trust. The lack of patches increases the window of exposure, and the vulnerability could be leveraged in larger denial-of-service campaigns or as part of multi-stage attacks targeting network infrastructure.

Organizations should immediately restrict access to the management interface of TOTOLINK AC1200 T8 routers by implementing network segmentation and firewall rules to limit exposure to trusted IP addresses only. Disable remote management features if not required. Monitor network traffic for unusual or malformed requests targeting the UploadCustomModule function. Regularly check TOTOLINK’s official channels for firmware updates addressing this vulnerability and apply patches promptly once available. Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting exploitation attempts of this vulnerability. For critical environments, evaluate replacing affected devices with models from vendors with active security support. Additionally, maintain robust network monitoring and incident response plans to quickly detect and mitigate denial-of-service incidents stemming from this vulnerability.