CVE-2026-71937

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.

CVSS v3 7.2 HIGH

7.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/
https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-poe-schedule-profile

Configurations

No configuration.

History

12 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Múltiples modelos de DrayTek VigorSwitch contienen una vulnerabilidad de desbordamiento de búfer en la función poe_schedule_profile. La vulnerabilidad es causada por la concatenación repetida de los campos start_date, start_time, duration_time, how_often, weekdays, monthly_date y cycle_duration en búferes pequeños de tamaño fijo sin comprobaciones de longitud adecuadas. Un atacante remoto puede activar esta vulnerabilidad mediante una entrada manipulada, causando una denegación de servicio o potencialmente ejecutando comandos arbitrarios. La explotación requiere credenciales administrativas válidas para la interfaz de gestión web del dispositivo.

Information

Published : 2026-08-24 18:17

Updated : 2026-10-12 22:10

NVD link : CVE-2026-71937

Mitre link : CVE-2026-71937

CVE.ORG link : CVE-2026-71937

JSON object : View

Products Affected

No product.

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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."}, {"lang": "es", "value": "M\u00faltiples modelos de DrayTek VigorSwitch contienen una vulnerabilidad de desbordamiento de b\u00fafer en la funci\u00f3n poe_schedule_profile. La vulnerabilidad es causada por la concatenaci\u00f3n repetida de los campos start_date, start_time, duration_time, how_often, weekdays, monthly_date y cycle_duration en b\u00faferes peque\u00f1os de tama\u00f1o fijo sin comprobaciones de longitud adecuadas. Un atacante remoto puede activar esta vulnerabilidad mediante una entrada manipulada, causando una denegaci\u00f3n de servicio o potencialmente ejecutando comandos arbitrarios. La explotaci\u00f3n requiere credenciales administrativas v\u00e1lidas para la interfaz de gesti\u00f3n web del dispositivo."}], "lastModified": "2026-10-12T22:10:00.247", "sourceIdentifier": "disclosure@vulncheck.com"}