What is the CVSS score of CVE-2021-20989?

CVE-2021-20989 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 2.0%.

Is there a public PoC exploit available for CVE-2021-20989?

Yes, a public proof-of-concept exploit is available for CVE-2021-20989. Prioritise patching immediately. EPSS: 2.0%.

Home Center 2 Firmware CVE-2021-20989

MEDIUM

Improper Certificate Validation (CWE-295)

2021-04-19 info@cert.vde.com

Information Disclosure Home Center 2 Firmware Home Center Lite Firmware

5.9

CVSS 3.1 · Vendor: cert

Severity by source

Vendor (cert) PRIMARY

5.9 MEDIUM

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

Primary rating from Vendor (cert) · only source for this CVE.

CVSS VectorVendor: cert

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Apr 19, 2021 - 14:15 cve.org

MEDIUM 5.9

DescriptionCVE.org

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.

AnalysisAI

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. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-295. 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. Affected products include: Fibaro Home Center 2 Firmware, Fibaro Home Center Lite Firmware. Version information: version 4.600.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.