What is the CVSS score of CVE-2021-20142?

CVE-2021-20142 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 3.7%.

Is there a public PoC exploit available for CVE-2021-20142?

Yes, a public proof-of-concept exploit is available for CVE-2021-20142. Prioritise patching immediately. EPSS: 3.7%.

Gryphon Tower Firmware CVE-2021-20142

HIGH

OS Command Injection (CWE-78)

2021-12-09 vulnreport@tenable.com

Command Injection Gryphon Tower Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Dec 09, 2021 - 16:15 nvd

HIGH 8.8

DescriptionNVD

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.

AnalysisAI

An unauthenticated command injection vulnerability exists in the parameters of operation 41 in the controller_server service on Gryphon Tower routers. Rated high severity (CVSS 8.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. 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 include: Gryphonconnect Gryphon Tower Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.