How severe is CVE-2021-20145?

CVE-2021-20145 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-20145 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20145?

CVE-2021-20145 affects Gryphonconnect Gryphon Tower Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20145?

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

When was CVE-2021-20145 published?

CVE-2021-20145 was published on 2021-12-09 and last updated on 2026-06-17.

CVE-2021-20145

CVE-2021-20145 is a high-severity vulnerability in Gryphonconnect Gryphon Tower Firmware with a CVSS 3.x base score of 7.5. 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-287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Gryphonconnect Gryphon Tower Firmware
Published: 2021-12-09
Last modified: 2026-06-17

Description

Gryphon Tower routers contain an unprotected openvpn configuration file which can grant attackers access to the Gryphon homebound VPN network which exposes the LAN interfaces of other users' devices connected to the same service. An attacker could leverage this to make configuration changes to, or otherwise attack victims' devices as though they were on an adjacent network.

Frequently asked questions

What is CVE-2021-20145?: Gryphon Tower routers contain an unprotected openvpn configuration file which can grant attackers access to the Gryphon homebound VPN network which exposes the LAN interfaces of other users' devices connected to the same service. An attacker could leverage this to make configuration changes to, or otherwise attack victims' devices as though they were on an adjacent network.
How severe is CVE-2021-20145?: CVE-2021-20145 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-20145 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20145?: CVE-2021-20145 affects Gryphonconnect Gryphon Tower Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20145?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-20145 published?: CVE-2021-20145 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:*:*:*:*:*:*:*:*

More vulnerabilities in Gryphonconnect Gryphon Tower Firmware

CVE-2021-20146 — Critical (CVSS 9.8): An unprotected ssh private key exists on the Gryphon devices which could be used to achieve root access to a server…
CVE-2021-20144 — High (CVSS 8.8): An unauthenticated command injection vulnerability exists in the parameters of operation 49 in the controller_server…
CVE-2021-20143 — High (CVSS 8.8): An unauthenticated command injection vulnerability exists in the parameters of operation 48 in the controller_server…
CVE-2021-20142 — High (CVSS 8.8): An unauthenticated command injection vulnerability exists in the parameters of operation 41 in the controller_server…
CVE-2021-20141 — High (CVSS 8.8): An unauthenticated command injection vulnerability exists in the parameters of operation 32 in the controller_server…
CVE-2021-20140 — High (CVSS 8.8): An unauthenticated command injection vulnerability exists in the parameters of operation 10 in the controller_server…

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
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