CVE-2021-20989

Name: CVE-2021-20989
Creator: NVD / NIST
Published: 2021-04-19T14:15:11.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2021-20989 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Fibaro Home Center 2 and Lite devices with firmware version 4.600 and older initiate SSH connections to the Fibaro cloud to provide remote access and remote support capabilities. This connection can be intercepted using DNS spoofing attack and a device initiated remote port-forward channel can be used to connect to the web management interface. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

Fibaro Home Center 2 and Lite devices with firmware version 4.600 and older initiate SSH connections to the Fibaro cloud to provide remote access and remote support capabilities. This connection can be intercepted using DNS spoofing attack and a device initiated remote port-forward channel can be used to connect to the web management interface. Knowledge of authorization credentials to the management interface is required to perform any further actions.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fibaro	Home Center 2 Firmware	<= 4.600
Fibaro	Home Center Lite Firmware	<= 4.600

References

http://packetstormsecurity.com/files/162243/Fibaro-Home-Center-MITM-Missing-Authentication-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Apr/27Mailing List, Third Party Advisory
https://www.iot-inspector.com/blog/advisory-fibaro-home-center/Exploit, Third Party Advisory
http://packetstormsecurity.com/files/162243/Fibaro-Home-Center-MITM-Missing-Authentication-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Apr/27Mailing List, Third Party Advisory
https://www.iot-inspector.com/blog/advisory-fibaro-home-center/Exploit, Third Party Advisory

Timeline

Published: Apr 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20989?

How severe is CVE-2021-20989?

CVE-2021-20989 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20989?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20989?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST