CVE-2025-14526 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The vulnerability resides in the frmL7ImForm function located in the /goform/L7Im endpoint. Specifically, the issue arises from improper handling of the 'page' argument, which, when manipulated, leads to a buffer overflow condition. This flaw allows remote attackers to send specially crafted requests to the vulnerable endpoint, triggering memory corruption. The exploitation does not require authentication or user interaction, making it highly accessible for attackers. Successful exploitation can result in arbitrary code execution, enabling attackers to take control of the device, or cause denial of service by crashing the system. The vulnerability has been assigned a CVSS 4.0 score of 8.7, indicating a high severity level due to its impact on confidentiality, integrity, and availability, combined with its ease of exploitation. Although no active exploitation has been reported in the wild, a public exploit has been released, increasing the likelihood of attacks. The vulnerability affects only firmware version 1.0.0.1 of the Tenda CH22, and no official patches have been published yet. The lack of patches and the public availability of exploits make this a critical issue for users of this device. The vulnerability is particularly concerning for organizations relying on Tenda CH22 routers in their network infrastructure, as compromise could lead to network breaches or disruption of services.

The impact of CVE-2025-14526 is significant for organizations using the Tenda CH22 router version 1.0.0.1. Exploitation can lead to full compromise of the device, allowing attackers to execute arbitrary code, which may result in unauthorized access to internal networks, interception or manipulation of network traffic, and potential lateral movement within the organization. The buffer overflow can also cause denial of service, disrupting network connectivity and impacting business operations. Given that the exploit requires no authentication or user interaction, attackers can remotely target vulnerable devices at scale. This increases the risk of widespread attacks, especially in environments where these routers serve as critical network gateways. The public release of an exploit further raises the threat level, as it lowers the barrier for attackers to weaponize this vulnerability. Organizations may face data breaches, service outages, and reputational damage if this vulnerability is exploited. The absence of official patches exacerbates the risk, forcing organizations to rely on temporary mitigations or device replacement.

To mitigate CVE-2025-14526, organizations should first verify if they are using Tenda CH22 routers running firmware version 1.0.0.1. Since no official patches are currently available, immediate mitigation steps include: 1) Restricting access to the router's management interface by implementing network segmentation and firewall rules to limit exposure to trusted IP addresses only. 2) Disabling remote management features if enabled, to prevent external attackers from reaching the vulnerable endpoint. 3) Monitoring network traffic for unusual activity targeting the /goform/L7Im endpoint or anomalous requests containing manipulated 'page' parameters. 4) Employing intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics designed to detect exploitation attempts of this vulnerability. 5) Considering temporary replacement or upgrade of affected devices to models without this vulnerability or with updated firmware once available. 6) Engaging with Tenda support channels to obtain information on forthcoming patches or workarounds. 7) Educating network administrators about the vulnerability and the importance of limiting device exposure. These steps go beyond generic advice by focusing on access control, monitoring, and proactive device management tailored to the specifics of this vulnerability.