CVE-2020-13389: Tendacn AC15 Firmware

Critical severity, CVSS 9.8. EPSS: 2.6% chance of exploitation in the next 30 days.

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/openSchedWifi schedStartTime and schedEndTime parameters for a POST request, a value is directly used in a strcpy to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

Affected products

• Tendacn AC15 Firmware: version v15.03.05.19_multi_td01 only
• Tendacn AC18 Firmware: version v15.03.05.19(6318) only
• Tendacn AC6 Firmware: version v15.03.05.19_multi_td01 only
• Tendacn AC9 Firmware: version v15.03.05.19(6318) only; version v15.03.06.42_multi only

Published 2020-05-22. Last modified 2026-06-17.