CVE-2026-3801 in Tenda
Summary
by MITRE • 03/09/2026
A vulnerability was found in Tenda i3 1.0.0.6(2204). Affected by this vulnerability is the function formSetAutoPing of the file /goform/setAutoPing. Performing a manipulation of the argument ping1/ping2 results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used.
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Analysis
by VulDB Data Team • 03/09/2026
This vulnerability exists in the Tenda i3 router firmware version 1.0.0.6(2204) within the web interface functionality. The specific flaw is located in the /goform/setAutoPing endpoint which handles the formSetAutoPing function. The vulnerability stems from improper input validation and handling of the ping1 and ping2 parameters, which are used to configure automatic ping monitoring functionality. When these parameters are manipulated with carefully crafted input, they trigger a stack-based buffer overflow condition that can be exploited by remote attackers without authentication.
The technical implementation of this vulnerability follows a classic stack buffer overflow pattern where insufficient bounds checking allows an attacker to write data beyond the allocated memory buffer. The CWE-121 classification applies here as the vulnerability represents a classic stack-based buffer overflow where the attacker can overwrite adjacent memory locations including return addresses and control data. This type of vulnerability is particularly dangerous because it can lead to arbitrary code execution on the affected device, potentially allowing full system compromise. The attack surface is expanded by the fact that this vulnerability is remotely exploitable through the web interface, eliminating the need for physical access or local network presence.
The operational impact of this vulnerability is significant for network security infrastructure. An attacker could potentially gain unauthorized access to the router's administrative functions, modify network configurations, redirect traffic, or establish persistent backdoors. This would compromise the entire network segment behind the affected router, as the device serves as a gateway and firewall for local network traffic. The public availability of exploit code increases the risk profile substantially, as it enables automated attacks against vulnerable devices across the internet. The router's role in network security makes this vulnerability particularly attractive to threat actors seeking to establish persistent access points within target networks.
Mitigation strategies should focus on immediate firmware updates from Tenda to address the buffer overflow condition through proper input validation and bounds checking. Network administrators should implement network segmentation to limit the potential impact of compromise, and consider disabling unnecessary web interface access where possible. The use of intrusion detection systems and monitoring for unusual traffic patterns on port 80 and 443 could help detect exploitation attempts. Additionally, implementing network access control lists to restrict access to the router's web interface to trusted IP addresses and employing strong authentication mechanisms would reduce the attack surface. Organizations should also consider regular vulnerability scanning of their network infrastructure to identify other potentially vulnerable devices that may share similar firmware issues, aligning with the principle of defense in depth as outlined in cybersecurity frameworks such as NIST SP 800-53.