CVE-2025-12272 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The flaw exists in the fromAddressNat function, specifically in the handling of the 'page' parameter within the /goform/addressNat endpoint. When an attacker sends a specially crafted request manipulating this argument, it causes a buffer overflow condition. This vulnerability is remotely exploitable over the network without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can lead to arbitrary code execution, allowing attackers to take control of the device, disrupt network traffic, or pivot to internal networks. The CVSS v4.0 score of 8.7 reflects its high severity, with a vector indicating network attack vector, low attack complexity, no privileges or user interaction needed, and high impact on confidentiality, integrity, and availability. While no confirmed exploits in the wild have been reported yet, the public release of exploit code increases the likelihood of imminent attacks. The vulnerability affects only version 1.0.0.1 of the firmware, and no official patch has been linked yet, emphasizing the need for immediate mitigation steps. This flaw is critical for network security as routers are a primary gateway device, and compromise can lead to widespread network infiltration or denial of service.

For European organizations, this vulnerability poses a significant risk to network security, especially for small and medium enterprises or home office setups that commonly deploy Tenda CH22 routers due to their cost-effectiveness. Successful exploitation can lead to full device compromise, allowing attackers to intercept, modify, or block network traffic, potentially leading to data breaches, espionage, or disruption of business operations. Critical infrastructure relying on these devices could experience outages or unauthorized access. The lack of authentication and user interaction requirements lowers the barrier for attackers, increasing the threat landscape. Additionally, the public availability of exploit code may lead to rapid weaponization by cybercriminals or state-sponsored actors targeting European networks. The impact extends beyond individual devices, as compromised routers can serve as footholds for lateral movement within corporate or governmental networks, amplifying the damage.

1. Immediate network segmentation to isolate Tenda CH22 devices from critical systems and sensitive data. 2. Implement strict firewall rules to block external access to the /goform/addressNat endpoint or restrict management interfaces to trusted IP addresses only. 3. Monitor network traffic for unusual requests targeting the vulnerable endpoint and deploy intrusion detection/prevention systems with updated signatures. 4. Engage with Tenda support channels to obtain firmware updates or security advisories; if unavailable, consider temporary replacement of affected devices with more secure alternatives. 5. Conduct thorough audits of all network devices to identify any running the vulnerable firmware version 1.0.0.1. 6. Educate IT staff on the vulnerability and ensure rapid incident response plans are in place in case of exploitation. 7. Apply network-level mitigations such as deep packet inspection to detect and block exploit attempts. 8. Maintain up-to-date backups and recovery procedures to minimize downtime in case of device compromise.