What is the CVSS score of CVE-2021-20990?

CVE-2021-20990 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 3.4%.

Is there a public PoC exploit available for CVE-2021-20990?

Yes, a public proof-of-concept exploit is available for CVE-2021-20990. Prioritise patching immediately. EPSS: 3.4%.

Home Center 2 Firmware CVE-2021-20990

HIGH

Missing Authentication for Critical Function (CWE-306)

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

Authentication Bypass Home Center 2 Firmware Home Center Lite Firmware

7.5

CVSS 3.1 · Vendor: cert

Severity by source

Vendor (cert) PRIMARY

7.5 HIGH

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

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

CVSS VectorVendor: cert

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Apr 19, 2021 - 14:15 cve.org

HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. 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. 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. Require authentication for all sensitive operations, implement defense in depth.