How severe is CVE-2021-20990?

CVE-2021-20990 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 none, integrity none, and availability high.

Is CVE-2021-20990 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20990?

CVE-2021-20990 primarily affects Fibaro Home Center 2 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20990?

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-2021-20990 published?

CVE-2021-20990 was published on 2021-04-19 and last updated on 2026-06-17.

CVE-2021-20990

CVE-2021-20990 is a high-severity vulnerability in Fibaro Home Center 2 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-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Fibaro Home Center 2 Firmware
Published: 2021-04-19
Last modified: 2026-06-17

Description

In Fibaro Home Center 2 and Lite devices with firmware version 4.600 and older an internal management service is accessible on port 8000 and some API endpoints could be accessed without authentication to trigger a shutdown, a reboot or a reboot into recovery mode.

Frequently asked questions

What is CVE-2021-20990?: In Fibaro Home Center 2 and Lite devices with firmware version 4.600 and older an internal management service is accessible on port 8000 and some API endpoints could be accessed without authentication to trigger a shutdown, a reboot or a reboot into recovery mode.
How severe is CVE-2021-20990?: CVE-2021-20990 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 none, integrity none, and availability high.
Is CVE-2021-20990 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20990?: CVE-2021-20990 primarily affects Fibaro Home Center 2 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20990?: 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-2021-20990 published?: CVE-2021-20990 was published on 2021-04-19 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:fibaro:home_center_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:fibaro:home_center_lite_firmware:*:*:*:*:*:*:*:*

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CVE-2021-20991 — Critical (CVSS 9.8): In Fibaro Home Center 2 and Lite devices with firmware version 4.540 and older an authenticated user can run commands…
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CVE-2021-20989 — Medium (CVSS 5.9): Fibaro Home Center 2 and Lite devices with firmware version 4.600 and older initiate SSH connections to the Fibaro…

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