CVE-2021-20139

8.8 highEPSS 4.0%

High (8.8) in gryphonconnect gryphon tower firmware. EPSS 4.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 4.0% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
CWE: CWE-78
Published: 2021-12-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

gryphonconnect:gryphon_tower_firmware

References

https://www.tenable.com/security/research/tra-2021-51
https://www.tenable.com/security/research/tra-2021-51

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