CVE-2021-20144: Gryphonconnect Gryphon Tower Firmware

High severity, CVSS 8.8. EPSS: 3.7% chance of exploitation in the next 30 days.

An unauthenticated command injection vulnerability exists in the parameters of operation 49 in the controller_server service on Gryphon Tower routers. An unauthenticated remote attacker on the same network can execute commands as root on the device by sending a specially crafted malicious packet to the controller_server service on port 9999.

Affected products

• Gryphonconnect Gryphon Tower Firmware: up to and including 04.0004.12

Published 2021-12-09. Last modified 2026-06-17.