CVE-2025-12271 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The vulnerability resides in the fromRouteStatic function of the /goform/RouteStatic endpoint, where the 'page' argument is improperly validated, allowing an attacker to overflow a buffer remotely. This flaw can be exploited without any authentication or user interaction, making it highly accessible to remote attackers. The buffer overflow can lead to arbitrary code execution, potentially granting attackers full control over the affected device. The vulnerability has a CVSS 4.0 base score of 8.7, indicating a high severity due to its network attack vector, low complexity, no privileges required, and no user interaction needed. The vulnerability affects the confidentiality, integrity, and availability of the device, as attackers can manipulate routing configurations or disrupt network operations. Although no known exploits are currently active in the wild, publicly available exploit code increases the likelihood of future attacks. The lack of an official patch at the time of publication necessitates immediate mitigation efforts by affected organizations. Given the widespread use of Tenda routers in small to medium enterprises and home environments, this vulnerability poses a significant risk to network security and stability.

For European organizations, exploitation of CVE-2025-12271 could lead to complete compromise of network routers, resulting in unauthorized access to internal networks, interception or manipulation of network traffic, and potential lateral movement to other critical systems. This could disrupt business operations, cause data breaches involving sensitive or personal data protected under GDPR, and damage organizational reputation. Critical infrastructure sectors such as telecommunications, finance, and government agencies relying on Tenda CH22 devices are particularly at risk. The vulnerability’s remote exploitability without authentication increases the attack surface, especially for organizations with exposed management interfaces or insufficient network segmentation. Additionally, the availability of public exploit code raises the risk of automated attacks and widespread exploitation, potentially leading to large-scale network outages or botnet recruitment within European networks.

Organizations should immediately inventory their network devices to identify any Tenda CH22 routers running firmware version 1.0.0.1. If an official patch or firmware update is released by Tenda, it should be applied promptly. Until a patch is available, network administrators should restrict access to the /goform/RouteStatic endpoint by implementing firewall rules or access control lists to block unauthorized remote requests. Network segmentation should be enforced to isolate vulnerable devices from critical systems and sensitive data. Intrusion detection and prevention systems (IDS/IPS) should be configured to detect and block exploit attempts targeting this vulnerability. Regular monitoring of network traffic for anomalous activity related to the vulnerable endpoint is recommended. Additionally, organizations should consider replacing affected devices with more secure alternatives if timely patching is not feasible. Employee awareness about the risks of exposed network devices and the importance of secure configurations can further reduce exploitation likelihood.