What’s Vulnerable › Vulnerabilities

CVE-2021-20142

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-09 · updated 2026-06-17
• Weakness: CWE-78

Description

An unauthenticated command injection vulnerability exists in the parameters of operation 41 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

• Gryphon Tower router: through 04.0004.12

References

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

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