Critical Stack-based Buffer Overflow Vulnerability in Tenda G0 Devices

A high-severity stack-based buffer overflow vulnerability, CVE-2026-19790, has been identified in Tenda G0 devices up to version 20260625. The flaw exists in the formSetPortMirror function of the httpd Web Management Interface, allowing remote attackers to exploit the vulnerability by manipulating the portMirrorMirroredPorts argument. This can lead to arbitrary code execution, system data modification, or service crashes. Public exploit code is available, and an authenticated user with low privileges can trigger the attack remotely. A patch is available, and users are advised to update their devices and restrict network access to the management interface. Cybersecurity professionals consider this an immediate threat requiring urgent mitigation. The CVSS score assigned is 8.8, indicating a high severity level.

Key Points: • CVE-2026-19790 is a critical stack-based buffer overflow vulnerability in Tenda G0 devices. • The vulnerability can be exploited remotely by authenticated users with low privileges. • A patch is available, and immediate action is recommended to mitigate the threat.