CVE-2025-12322 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The vulnerability resides in the fromNatStaticSetting function, which processes requests to the /goform/NatStaticSetting endpoint. Specifically, the 'page' argument is not properly validated or bounds-checked, allowing an attacker to craft a malicious request that overflows the buffer. This overflow can corrupt memory, potentially enabling remote code execution or causing the device to crash, resulting in denial of service. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing the attack surface significantly. The CVSS 4.0 base score is 8.7, reflecting the network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. Although no active exploitation has been reported, a public exploit is available, raising the risk of imminent attacks. The affected product, Tenda CH22, is a consumer-grade router commonly used in home and small business environments, which may lack robust security monitoring. The absence of an official patch link suggests that users must monitor vendor advisories closely or implement workarounds to mitigate risk. This vulnerability exemplifies the risks posed by insecure input validation in embedded network devices.

The impact of CVE-2025-12322 is significant for organizations and individuals using Tenda CH22 routers. Successful exploitation can lead to remote code execution, allowing attackers to gain control over the device. This can enable interception or manipulation of network traffic, insertion of malicious payloads, or pivoting into internal networks. Additionally, exploitation can cause denial of service by crashing the device, disrupting internet connectivity and business operations. For enterprises relying on these routers in branch offices or remote sites, this could result in data breaches, operational downtime, and reputational damage. The vulnerability's remote and unauthenticated nature increases the likelihood of exploitation by opportunistic attackers or automated malware. Given the widespread use of Tenda routers in emerging markets and residential environments, the threat extends to millions of devices, potentially facilitating large-scale botnets or targeted espionage campaigns. The lack of a current patch or mitigation increases exposure time, emphasizing the urgency for affected users to act swiftly.

To mitigate CVE-2025-12322, affected users should immediately check for firmware updates from Tenda and apply any available patches. In the absence of an official patch, users should restrict access to the router's management interface by disabling remote administration and limiting access to trusted IP addresses only. Network segmentation should be employed to isolate vulnerable devices from critical infrastructure. Deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting this exploit can help detect and block malicious traffic. Users should monitor network logs for unusual requests to /goform/NatStaticSetting and anomalous traffic patterns. Employing web application firewalls (WAF) or router-level filtering to block malformed HTTP requests targeting the vulnerable endpoint can reduce risk. Regularly backing up router configurations and having a recovery plan in place is recommended in case of compromise. Finally, educating users about the risks of outdated firmware and encouraging timely updates will help reduce exposure to similar vulnerabilities.