CVE-2020-12834

Name: CVE-2020-12834
Creator: NVD / NIST
Published: 2020-05-15T17:15:12.5+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 11.07%

Last modified Jun 17, 2026

CVE-2020-12834 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. eQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the JSON API Method ReGa.runScript, by unauthenticated attackers with access to the web interface, due to the default auto-login feature being enabled during first-time setup (or factory reset).. EPSS estimates a 11.07% chance of exploitation in the next 30 days.

Description

eQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the JSON API Method ReGa.runScript, by unauthenticated attackers with access to the web interface, due to the default auto-login feature being enabled during first-time setup (or factory reset).

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

11.07%

95.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Eq-3	Homematic Ccu2 Firmware	<= 2.51.6
Eq-3	Ccu3 Firmware	<= 3.51.6

References

https://psytester.github.io/CVE-2020-12834/Exploit, Third Party Advisory
https://psytester.github.io/CVE-2020-12834/Exploit, Third Party Advisory

Timeline

Published: May 15, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12834?

How severe is CVE-2020-12834?

CVE-2020-12834 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 11.07% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12834?

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-2020-12834?

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

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Source: NVD / NIST