Is CVE-2021-20141 actively exploited?

No active exploitation of CVE-2021-20141 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20141 be exploited remotely?

Partially. CVE-2021-20141 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2021-20141?

CVE-2021-20141 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-20141

CWE-78Published: December 9, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

An unauthenticated command injection vulnerability exists in the parameters of operation 32 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.

NVD Source

Technical Analysis

CVE-2021-20141 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.