CVE-2026-3768 is a stack-based buffer overflow vulnerability identified in the Tenda F453 router firmware version 1.0.0.3. The vulnerability resides in the formWrlExtraSet function, specifically in the /goform/WrlExtraSet endpoint, where the GO argument is improperly handled, allowing an attacker to overflow the stack buffer. This overflow can corrupt the stack, enabling remote code execution (RCE) without requiring authentication or user interaction. The vulnerability is remotely exploitable over the network, making it highly dangerous for exposed devices. The CVSS 4.0 score of 8.7 indicates a high severity, with low attack complexity and no privileges or user interaction needed. The vulnerability impacts confidentiality, integrity, and availability by allowing attackers to execute arbitrary code, potentially taking full control of the device. Although no known exploits are currently active in the wild, public disclosure of exploit code increases the risk of imminent attacks. The lack of available patches at the time of disclosure necessitates immediate mitigation efforts. This vulnerability is critical for organizations relying on Tenda F453 routers, as compromised devices can serve as entry points into internal networks or be used for further malicious activities such as lateral movement, data exfiltration, or launching attacks on other systems.

The impact of CVE-2026-3768 is significant for organizations using Tenda F453 routers. Successful exploitation allows remote attackers to execute arbitrary code with the privileges of the router’s firmware process, potentially leading to full device compromise. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network services, and use of compromised devices as pivot points for further attacks. The vulnerability threatens confidentiality by exposing sensitive network data, integrity by allowing modification of router configurations or firmware, and availability by causing device crashes or denial of service. Given the router’s role as a network gateway, exploitation could affect entire organizational networks, impacting business operations and security posture. The public disclosure of exploit code increases the likelihood of exploitation attempts, especially targeting unpatched devices. Organizations without timely remediation may face data breaches, operational disruptions, and reputational damage.

1. Immediate mitigation should focus on isolating affected Tenda F453 routers from untrusted networks, especially the internet, to reduce exposure. 2. Monitor network traffic for unusual activity or signs of exploitation attempts targeting the /goform/WrlExtraSet endpoint. 3. Implement network segmentation to limit the impact of a compromised router on critical internal systems. 4. Contact Tenda support or check official channels for firmware updates or patches addressing CVE-2026-3768; apply them promptly once available. 5. If patches are not yet available, consider deploying Web Application Firewalls (WAFs) or Intrusion Prevention Systems (IPS) with custom rules to detect and block malicious payloads targeting the vulnerable endpoint. 6. Enforce strict access controls and disable remote management features on the router if not required. 7. Conduct regular vulnerability scanning and penetration testing to identify and remediate similar issues proactively. 8. Educate network administrators about this vulnerability and ensure incident response plans include steps for handling potential exploitation.