CVE-2026-78063 in CH22
Summary
by MITRE • 08/23/2026
A security flaw has been discovered in Tenda CH22 1.0.0.1. The impacted element is the function formeditFileName of the file /goform/editFileName. The manipulation of the argument editNameMit results in command injection. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks.
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Analysis
by VulDB Data Team • 08/23/2026
The discovery of a critical remote code execution vulnerability within Tenda CH22 1.0.0.1 firmware represents a significant risk to network infrastructure security, particularly in environments relying on this specific wireless router model. The flaw resides specifically within the formeditFileName function located in the /goform/editFileName endpoint, which is part of the device's web-based management interface. This component is responsible for handling file name modifications and related configuration updates through HTTP requests sent by administrators or potentially unauthenticated users depending on authentication bypasses that may accompany such flaws. The core technical deficiency lies in the improper validation and sanitization of the editNameMit argument passed to this function, allowing an attacker to inject arbitrary operating system commands directly into the underlying shell environment executing these form handlers.
This vulnerability is classified under CWE-78 Improper Neutralization of Special Elements used in an OS Command commonly known as OS Command Injection. The root cause stems from a failure to properly sanitize user-supplied input before it is concatenated and executed by system-level command interpreters such as sh or bash within the embedded Linux environment powering the router. When the editNameMit parameter contains maliciously crafted strings containing shell metacharacters like semicolons, pipes, or backticks, these characters are not stripped or escaped effectively. Consequently, instead of treating the input strictly as a file name string, the system interprets it as executable code, leading to the arbitrary execution of commands with the privileges of the web server process, which often runs with elevated permissions in embedded devices lacking strict privilege separation mechanisms.
The operational impact of this vulnerability is severe due to its remote exploitable nature and the availability of public exploits. An attacker located anywhere on the internet can interact with the vulnerable endpoint without prior authentication if the router's administrative interface is exposed or if additional vulnerabilities allow for credential bypass, which is common in IoT devices. By leveraging publicly available exploit code, adversaries can achieve full control over the compromised device. This level of access allows for a wide range of malicious activities including installing persistent backdoors, pivoting into internal networks to attack other connected devices, harvesting sensitive data such as Wi-Fi credentials and browsing history, or utilizing the router as part of a larger botnet infrastructure like Mirai variants. The presence of public exploits significantly lowers the barrier to entry for attackers, increasing the likelihood of automated scanning and exploitation campaigns targeting vulnerable IP ranges across global networks.
From an offensive security perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter execution, specifically T1059 which covers various scripting languages used in post-exploitation phases. The ability to execute commands remotely places this flaw squarely within the initial access or privilege escalation vectors depending on whether authentication is required prior to exploitation. Given that IoT devices often remain unpatched for extended periods due to lack of automatic update mechanisms, the window of exposure remains wide. Organizations and individual users must recognize that even consumer-grade networking equipment poses serious security risks when connected directly to the internet without adequate perimeter defenses such as firewalls or intrusion prevention systems configured to block outbound connections from compromised devices.
Mitigation strategies for this vulnerability are primarily focused on immediate isolation and long-term architectural changes since vendor patches may not be readily available or timely. The most effective immediate action is to remove the Tenda CH22 1.0.0.1 device from any network segment that has direct internet access, placing it behind a robust firewall with strict ingress and egress filtering rules. If remote management features are enabled on similar devices, they should be disabled immediately as this reduces the attack surface significantly by preventing external actors from reaching vulnerable endpoints like /goform/editFileName. Users should also verify if firmware updates have been released that address this specific command injection flaw in newer versions of the software and apply them promptly to ensure proper input sanitization is enforced at the application layer.
Long-term remediation requires a shift towards more secure IoT development practices emphasizing strict input validation, parameterized commands where possible, and principle of least privilege for all service accounts running web interfaces on embedded systems. Network segmentation plays a crucial role in limiting lateral movement should such a vulnerability be exploited; keeping IoT devices on isolated VLANs prevents attackers from using the compromised router as a pivot point to access critical internal assets like servers or workstations. Additionally, deploying network-based intrusion detection and prevention systems capable of identifying command injection patterns in HTTP traffic can provide an additional layer of defense by blocking malicious payloads before they reach the vulnerable application logic. Regular vulnerability assessments and penetration testing of all internet-facing devices are essential to identify similar flaws across diverse hardware vendors and firmware versions before they can be weaponized by threat actors.