CVE-2026-3376 identifies a critical buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3. The vulnerability resides in the fromSafeMacFilter function of the /goform/SafeMacFilter endpoint, which improperly processes the 'page' parameter. When manipulated, this parameter causes a buffer overflow condition, enabling remote attackers to execute arbitrary code or cause denial of service. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its severity and ease of exploitation. The CVSS 4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges needed. Although no active exploits have been reported in the wild, the public availability of exploit code raises the likelihood of imminent attacks. The affected device, Tenda F453, is a consumer and small business router commonly deployed in various regions, making the vulnerability a significant risk for network security. The lack of available patches or official vendor mitigation at the time of disclosure further exacerbates the threat landscape.

The exploitation of this buffer overflow vulnerability can lead to full compromise of the Tenda F453 router, allowing attackers to execute arbitrary code remotely. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network services, and potential pivoting to other connected systems. For organizations, this means exposure to data breaches, operational downtime, and loss of network integrity. Since the router often serves as a gateway device, its compromise can undermine the security of the entire network infrastructure. The absence of authentication requirements and user interaction lowers the barrier for attackers, increasing the risk of widespread exploitation. Additionally, the public disclosure of the exploit code may accelerate the development of automated attack tools targeting this vulnerability.

Organizations should immediately assess their network for the presence of Tenda F453 routers running firmware version 1.0.0.3. Until an official patch is released, network administrators should implement strict network segmentation to isolate vulnerable devices from critical assets. Deploying firewall rules to restrict access to the /goform/SafeMacFilter endpoint from untrusted networks can reduce exposure. Monitoring network traffic for unusual requests targeting this endpoint can help detect exploitation attempts. If possible, disable remote management features on the router or restrict management access to trusted IP addresses only. Consider replacing affected devices with models from vendors with timely security updates if patching is not feasible. Regularly check for vendor advisories and apply firmware updates as soon as they become available. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once released.