CVE-2026-3168 identifies a critical buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3. The vulnerability resides in the httpd service, specifically within the fromNatStaticSetting function that processes requests to the /goform/NatStaticSetting endpoint. The flaw is triggered by improper handling of the 'page' argument, which can be manipulated remotely by an unauthenticated attacker to overflow a buffer. This overflow can corrupt memory, potentially allowing arbitrary code execution, system crashes, or denial of service conditions. The vulnerability requires no user interaction and no prior authentication, making it highly exploitable over the network. The availability of a public exploit increases the likelihood of exploitation. The vulnerability affects the confidentiality, integrity, and availability of the device, as attackers could gain control or disrupt network operations. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low attack complexity, no user interaction, and partial privileges required, with high impact on all security properties. No official patches have been linked yet, so mitigation relies on network controls and monitoring. This vulnerability is significant given the widespread use of Tenda routers in consumer and small business environments.

The exploitation of CVE-2026-3168 can have severe consequences for organizations using Tenda F453 routers. Successful exploitation may allow remote attackers to execute arbitrary code with elevated privileges, leading to full compromise of the device. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network services, and potential pivoting to other internal systems. The buffer overflow can also cause denial of service by crashing the router, impacting availability. Given that these routers are often deployed in small offices and home environments, the vulnerability could be leveraged to create botnets or launch further attacks. The lack of authentication and user interaction requirements makes the attack vector broad and easy to exploit remotely. Organizations relying on these devices for critical network functions face risks to confidentiality, integrity, and availability of their communications and data. The public availability of exploits increases the urgency to address this vulnerability.

1. Immediate mitigation should include isolating affected Tenda F453 devices from untrusted networks and restricting access to the /goform/NatStaticSetting endpoint via firewall rules or access control lists. 2. Monitor network traffic for unusual requests targeting the vulnerable endpoint and implement intrusion detection/prevention systems (IDS/IPS) signatures to detect exploitation attempts. 3. Disable remote management features on the router if enabled, to reduce exposure. 4. Regularly check for firmware updates from Tenda and apply patches as soon as they become available. 5. If patches are not yet released, consider replacing affected devices with alternative hardware from vendors with timely security support. 6. Employ network segmentation to limit the impact of a compromised router on critical internal systems. 7. Educate users and administrators about the risks and signs of exploitation to enable rapid response. 8. Conduct regular security assessments of network devices to identify and remediate vulnerabilities proactively.