How severe is CVE-2021-20146?

CVE-2021-20146 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20146 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20146?

CVE-2021-20146 affects Gryphonconnect Gryphon Tower Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20146?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-20146 published?

CVE-2021-20146 was published on 2021-12-09 and last updated on 2026-06-17.

CVE-2021-20146

CVE-2021-20146 is a critical-severity vulnerability in Gryphonconnect Gryphon Tower Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Gryphonconnect Gryphon Tower Firmware
Published: 2021-12-09
Last modified: 2026-06-17

Description

An unprotected ssh private key exists on the Gryphon devices which could be used to achieve root access to a server affiliated with Gryphon's development and infrastructure. At the time of discovery, the ssh key could be used to login to the development server hosted in Amazon Web Services.

Frequently asked questions

What is CVE-2021-20146?: An unprotected ssh private key exists on the Gryphon devices which could be used to achieve root access to a server affiliated with Gryphon's development and infrastructure. At the time of discovery, the ssh key could be used to login to the development server hosted in Amazon Web Services.
How severe is CVE-2021-20146?: CVE-2021-20146 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20146 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20146?: CVE-2021-20146 affects Gryphonconnect Gryphon Tower Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20146?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-20146 published?: CVE-2021-20146 was published on 2021-12-09 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:gryphonconnect:gryphon_tower_firmware:*:*:*:*:*:*:*:*

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