CVE-2025-12272 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The vulnerability resides in the fromAddressNat function, which processes requests to the /goform/addressNat endpoint. Specifically, the issue arises when the 'page' argument is manipulated, causing a buffer overflow that can be exploited remotely. This flaw does not require user interaction or prior authentication, making it highly accessible to attackers. The buffer overflow could allow an attacker to execute arbitrary code remotely, potentially gaining control over the device or causing a denial of service. The vulnerability has been assigned a CVSS 4.0 base score of 8.7, reflecting its high impact on confidentiality, integrity, and availability. The exploit has been publicly disclosed, increasing the likelihood of exploitation attempts. No official patches have been linked yet, so mitigation currently relies on network-level controls and monitoring. The vulnerability affects only version 1.0.0.1 of the Tenda CH22 firmware. Given the critical role of routers in network infrastructure, exploitation could lead to significant compromise of internal networks.

The impact of CVE-2025-12272 is substantial for organizations using Tenda CH22 routers. Successful exploitation could allow attackers to execute arbitrary code remotely, leading to full compromise of the device. This could result in interception or manipulation of network traffic, unauthorized access to internal resources, and disruption of network availability. The vulnerability threatens confidentiality by enabling data interception or exfiltration, integrity by allowing modification of network configurations or traffic, and availability through potential denial of service conditions. Since routers are often the first line of defense and gateway to internal networks, compromise could facilitate lateral movement and further attacks within an organization. The public release of exploit code increases the risk of widespread attacks, especially against unpatched or poorly secured devices. Organizations in sectors relying heavily on Tenda CH22 devices for network connectivity are particularly vulnerable to operational disruptions and data breaches.

1. Immediately restrict remote access to the /goform/addressNat endpoint by implementing firewall rules or access control lists to block unauthorized external traffic. 2. Disable any unnecessary remote management features on Tenda CH22 devices to reduce the attack surface. 3. Monitor network traffic for unusual or malformed requests targeting the /goform/addressNat path, using intrusion detection or prevention systems. 4. Apply firmware updates from Tenda as soon as they become available; if no official patch exists, contact Tenda support for guidance or consider upgrading to a newer, unaffected device model. 5. Segment networks to isolate vulnerable devices and limit potential lateral movement in case of compromise. 6. Conduct regular vulnerability assessments and penetration tests focusing on network infrastructure devices to detect similar issues proactively. 7. Educate network administrators about this vulnerability and the importance of timely patching and secure configuration of network devices.