CVE-2025-12273 identifies a buffer overflow vulnerability in the Tenda CH22 device firmware version 1.0.0.1. The flaw resides in the fromwebExcptypemanFilter function within the /goform/webExcptypemanFilter file, where improper handling of the 'page' argument allows an attacker to overflow a buffer. This vulnerability can be exploited remotely over the network without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow could enable attackers to execute arbitrary code, potentially gaining full control over the device, or cause denial of service by crashing the system. The CVSS 4.0 vector indicates low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Although no exploits have been observed in the wild, the availability of public exploit code increases the likelihood of imminent attacks. The vulnerability affects a specific firmware version, and no official patch has been linked yet, highlighting the urgency for mitigation. The Tenda CH22 is likely a consumer or small business network device, which may be widely deployed in various countries, especially where Tenda products have strong market penetration. This vulnerability poses a significant risk to network security, as compromised devices can be used as entry points for broader network attacks or for launching attacks on other targets.

The impact of CVE-2025-12273 is substantial for organizations using Tenda CH22 devices. Successful exploitation can lead to remote code execution, allowing attackers to take full control of the device, manipulate network traffic, intercept sensitive data, or disrupt network availability through denial of service. This compromises the confidentiality, integrity, and availability of the affected network segment. Given the device’s role in network infrastructure, attackers could pivot to internal networks, escalate privileges, or establish persistent footholds. The lack of authentication and user interaction requirements lowers the barrier for exploitation, increasing the risk of widespread attacks. Organizations with large deployments of Tenda CH22 devices or those in critical infrastructure sectors face elevated risks. The availability of public exploit code further increases the likelihood of exploitation attempts, potentially leading to data breaches, operational disruptions, and reputational damage.

1. Immediate mitigation should include network-level access controls to restrict external access to the Tenda CH22 management interfaces, especially blocking access to the /goform/webExcptypemanFilter endpoint. 2. Deploy network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data. 3. Monitor network traffic for unusual patterns or exploit attempts targeting the vulnerable function or URL path. 4. Disable remote management features if not required to reduce exposure. 5. Engage with Tenda support or vendor channels to obtain official patches or firmware updates as soon as they become available. 6. If patching is delayed, consider temporary device replacement or usage of alternative secure devices. 7. Implement intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once available. 8. Conduct regular vulnerability scans to identify affected devices within the network. 9. Educate network administrators about the vulnerability and signs of exploitation to enable rapid response. 10. Maintain up-to-date backups and incident response plans to mitigate potential damage from successful exploitation.