CVE-2021-37273: Chinatelecom Epon Tianyi Gateway Zxhn f450 Firmware

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of "Optical Modem Smart Router." Attackers can use this vulnerability to restart the device multiple times.

Affected products

• Chinatelecom Epon Tianyi Gateway Zxhn f450 Firmware: version 3.0 only

Published 2021-09-28. Last modified 2026-06-17.