CVE-2021-31627: Tendacn AC9 Firmware

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Buffer Overflow vulnerability in Tenda AC9 V1.0 through V15.03.05.19(6318), and AC9 V3.0 V15.03.06.42_multi, allows attackers to execute arbitrary code via the index parameter.

Affected products

• Tendacn AC9 Firmware: up to and including 15.03.06.42_multi; up to and including 15.03.05.19\(6318\)

Published 2021-10-29. Last modified 2026-07-09.