CVE-2024-51313 in TX9
Summary
by MITRE • 07/21/2026
The Tenda TX9 V22.03.02.20 firmware has a stack overflow vulnerability in the sub_42EA38 function of the file /goform/SetVirtualServerCfg.
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Analysis
by VulDB Data Team • 07/21/2026
The Tenda TX9 router running firmware version V22.03.02.20 contains a critical stack overflow vulnerability within the sub_42EA38 function located in the /goform/SetVirtualServerCfg file. This vulnerability represents a severe security flaw that could allow remote attackers to execute arbitrary code on the affected device. The stack overflow occurs when processing input data through the virtual server configuration form, specifically during the handling of user-supplied parameters that are not properly validated or sanitized before being copied onto the stack. Such vulnerabilities typically arise from insufficient bounds checking mechanisms in the firmware's input processing routines.
This particular flaw falls under the category of buffer overflow vulnerabilities as classified by CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent stack memory locations. The vulnerability is particularly concerning because it exists within a web form handler that processes administrative configuration requests, making it accessible via network-based attacks without requiring physical access to the device. Attackers could potentially exploit this weakness by sending specially crafted HTTP requests to the router's web interface, triggering the vulnerable function and allowing for arbitrary code execution with the privileges of the web server process.
The operational impact of this vulnerability extends beyond simple remote code execution, as it provides attackers with a potential foothold for further network infiltration. The affected device operates as a router and gateway within home or small office networks, making it a valuable target for attackers seeking to establish persistent access points. Once exploited, the vulnerability could enable attackers to modify network configurations, redirect traffic through malicious servers, or even use the compromised device as a launch point for attacks against other networked systems. The attack surface is particularly wide given that the vulnerability exists in an administrative interface function, potentially allowing unauthorized users to gain full control over the router's configuration and network traffic management capabilities.
Security professionals should prioritize immediate mitigation of this vulnerability through firmware updates from Tenda, as no reliable workarounds exist for this specific stack overflow condition. Network administrators should implement strict firewall rules limiting access to the router's administrative interface to trusted IP addresses only, while also monitoring for suspicious network activity that might indicate exploitation attempts. The vulnerability demonstrates poor input validation practices in the firmware codebase and highlights the importance of secure coding standards such as those outlined in the CERT Secure Coding Standards, particularly the guidelines related to buffer overflow prevention and memory safety. Organizations should also consider implementing network segmentation and regular vulnerability scanning to detect similar issues across their network infrastructure, as this type of vulnerability often indicates broader security weaknesses in embedded systems development practices.