CVE-2026-71936 [HIGH] – Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysrebo

Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysreboot function. The vulnerability is caused by unsafe concatenation of split valueN data into a fixed-size 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.