CVE-2026-4551 is a stack-based buffer overflow vulnerability identified in the Tenda F453 router firmware version 1.0.0.3. The vulnerability resides in the fromSafeClientFilter function of the /goform/SafeClientFilter component, specifically triggered by crafted input in the 'menufacturer/Go' argument. This flaw allows an attacker to overflow the stack buffer remotely, without requiring authentication or user interaction, due to improper input validation and bounds checking. Exploiting this vulnerability can lead to arbitrary code execution or denial of service, compromising the device's confidentiality, integrity, and availability. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with an attack vector of network (remote), low attack complexity, no privileges required, and no user interaction needed. The vulnerability scope is limited to the affected firmware version 1.0.0.3 of the Tenda F453 router. While no confirmed exploits are reported in the wild, a public exploit exists, increasing the urgency for remediation. The vulnerability affects the Parameters Handler component, which is critical for device configuration, making exploitation impactful. Given the widespread use of Tenda routers in residential and small business environments, this vulnerability poses a significant risk if left unaddressed.

The impact of CVE-2026-4551 is substantial for organizations and individuals using the Tenda F453 router with the vulnerable firmware. Successful exploitation can lead to remote code execution, allowing attackers to take full control of the device, manipulate network traffic, intercept sensitive data, or launch further attacks within the network. This compromises the confidentiality and integrity of network communications and can disrupt availability through denial-of-service conditions. Small businesses and home users relying on these routers for internet connectivity are particularly vulnerable, as compromised devices can serve as entry points for broader network intrusions or botnet recruitment. The lack of authentication and user interaction requirements lowers the barrier for attackers, increasing the likelihood of exploitation. The public availability of an exploit further elevates the risk, potentially leading to widespread attacks. Organizations with limited patch management capabilities or those unaware of the vulnerability face increased exposure. The vulnerability could also be leveraged in targeted attacks against regions or sectors where Tenda devices are prevalent, impacting critical infrastructure or sensitive environments.

To mitigate CVE-2026-4551, organizations should immediately verify if their Tenda F453 devices are running firmware version 1.0.0.3 and prioritize upgrading to a patched firmware version once released by the vendor. In the absence of an official patch, temporary mitigations include disabling remote management interfaces to reduce exposure to external attackers and restricting access to the /goform/SafeClientFilter endpoint via firewall rules or network segmentation. Network administrators should monitor logs and network traffic for unusual requests targeting the vulnerable parameter 'menufacturer/Go'. Implementing intrusion detection or prevention systems with signatures for this exploit can help detect and block attempts. Additionally, isolating vulnerable devices from critical network segments limits potential lateral movement. Users should change default credentials and ensure strong authentication mechanisms are in place for device management. Regularly reviewing vendor advisories and subscribing to vulnerability notifications will help maintain timely awareness of updates. Finally, organizations should consider replacing outdated or unsupported devices with models that receive ongoing security updates.