CVE-2025-12273 identifies a buffer overflow vulnerability in Tenda CH22 firmware version 1.0.0.1, located in the function fromwebExcptypemanFilter within the /goform/webExcptypemanFilter endpoint. The vulnerability arises from improper handling of the 'page' argument, which can be manipulated by an unauthenticated remote attacker to overflow a buffer. This overflow can lead to arbitrary code execution or denial of service on the affected device. The attack vector is network-based (AV:N), requiring no authentication (AT:N) or user interaction (UI:N), and has low attack complexity (AC:L). The vulnerability impacts confidentiality, integrity, and availability at a high level (VC:H, VI:H, VA:H), making it critical for device security. Although no exploits have been observed in the wild yet, a public exploit is available, increasing the likelihood of exploitation. The affected product, Tenda CH22, is a consumer-grade networking device often used in home and small office environments, which may also be present in enterprise edge networks. The absence of an official patch or vendor advisory increases the urgency for organizations to apply compensating controls. The vulnerability’s exploitation could allow attackers to gain control over the device, intercept or manipulate network traffic, or disrupt network services.

For European organizations, exploitation of CVE-2025-12273 could result in significant security breaches including unauthorized access to internal networks, interception of sensitive communications, and disruption of network availability. Compromise of Tenda CH22 devices could serve as a foothold for lateral movement within corporate or governmental networks, potentially leading to data exfiltration or sabotage. Small and medium enterprises, as well as home office setups increasingly integrated into corporate networks, are particularly vulnerable due to the widespread use of consumer-grade devices like the Tenda CH22. The impact extends beyond individual organizations to critical infrastructure sectors that rely on these devices for network connectivity. Given the high CVSS score and the availability of a public exploit, the threat level is elevated, and successful exploitation could undermine trust in network security and lead to regulatory and compliance repercussions under European data protection laws.

Since no official patch is currently available, European organizations should implement immediate compensating controls. These include isolating Tenda CH22 devices on separate VLANs or network segments to limit exposure. Restrict remote management access to trusted IP addresses and disable any unnecessary web management interfaces. Employ network intrusion detection and prevention systems (IDS/IPS) to monitor and block suspicious requests targeting the /goform/webExcptypemanFilter endpoint. Regularly audit network devices for firmware versions and replace or upgrade vulnerable devices where possible. Educate users and administrators about the risks of using consumer-grade networking equipment in enterprise environments. Additionally, consider deploying network access control (NAC) solutions to enforce device compliance and prevent unauthorized devices from connecting. Maintain vigilant monitoring for signs of exploitation attempts and prepare incident response plans specific to network device compromise.