An unauthenticated command injection vulnerability exists in the parameters of operation 3 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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-20139
• https://www.tenable.com/security/research/tra-2021-51