CVE-2024-40414 is a stack-based buffer overflow vulnerability identified in the Tenda AX1806 router firmware version 1.0.0.1. The vulnerability resides in the /goform/SetNetControlList endpoint, specifically within the sub_656BC function, which improperly handles input data leading to a buffer overflow condition (CWE-121). This flaw can be triggered remotely by an attacker without requiring any authentication or user interaction, making it highly exploitable. The buffer overflow allows the attacker to overwrite the stack, potentially executing arbitrary code with the privileges of the router’s firmware process. Given the router’s role in network traffic management, successful exploitation could lead to full device compromise, enabling attackers to intercept, modify, or disrupt network communications. The CVSS v3.1 score of 9.6 reflects the vulnerability’s critical nature, with attack vector being adjacent network (AV:A), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and complete impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits have been reported yet, the vulnerability’s characteristics make it a prime target for attackers once exploit code becomes available. The lack of available patches at the time of publication increases the urgency for organizations to implement interim mitigations.

The impact of CVE-2024-40414 is severe for organizations using the Tenda AX1806 router. Exploitation can lead to complete compromise of the device, allowing attackers to execute arbitrary code, disrupt network services, and intercept or manipulate sensitive data passing through the router. This can result in loss of confidentiality, integrity, and availability of network communications. For enterprises, this could mean unauthorized access to internal networks, data breaches, and potential lateral movement to other critical systems. For consumers, compromised routers can be used as part of botnets or for man-in-the-middle attacks. The vulnerability’s remote exploitability without authentication or user interaction significantly increases the attack surface and risk. The absence of known exploits currently provides a window for proactive defense, but the critical severity demands immediate attention to prevent future exploitation.

1. Immediately disable remote management interfaces on the Tenda AX1806 router to reduce exposure to network-based attacks. 2. Segment networks to isolate vulnerable devices from critical infrastructure and sensitive data flows. 3. Monitor network traffic for unusual requests targeting the /goform/SetNetControlList endpoint or other suspicious activity indicative of exploitation attempts. 4. Apply firmware updates or patches from Tenda as soon as they become available; regularly check vendor advisories. 5. If patching is delayed, consider deploying network-based intrusion prevention systems (IPS) with custom signatures to detect and block exploitation attempts targeting this vulnerability. 6. Educate network administrators about this vulnerability and enforce strict access controls on management interfaces. 7. Conduct regular vulnerability scans and penetration tests to identify and remediate exposure to this and similar vulnerabilities. 8. Maintain an incident response plan to quickly address potential compromises involving network infrastructure devices.