CVE-2026-71938DrayTek VigorSwitch Multiple Models Buffer Overflow via switch_lan_gvrp

Descripción

Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the switch_lan_gvrp function. The vulnerability is caused by unsafe copying of the portList field into an undersized buffer. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/ vendor-advisory
• VulnCheck Advisory: DrayTek VigorSwitch Multiple Models Buffer Overflow via switch_lan_gvrp third-party-advisory