CVE-2026-71937 — DrayTek VigorSwitch Multiple Models Buffer Overflow via poe_schedule_profile

Affected: DrayTek Corporation VigorSwitch G2540xs, DrayTek Corporation VigorSwitch P2540xs, DrayTek Corporation VigorSwitch FX2120, DrayTek Corporation VigorSwitch G2282x, DrayTek Corporation VigorSwitch P2282x, DrayTek Corporation VigorSwitch Q2300x, DrayTek Corporation VigorSwitch PQ2300xb, DrayTek Corporation VigorSwitch G2542x, DrayTek Corporation VigorSwitch P2542x, DrayTek Corporation VigorSwitch P2542xh and 18 more

Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. 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.

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CVE-2026-71937 — DrayTek VigorSwitch Multiple Models Buffer Overflow via poe_schedule_profile