CVE-2021-33032

Name: CVE-2021-33032
Creator: NVD / NIST
Published: 2021-07-22T18:15:23.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 52.16%

Last modified Jun 17, 2026

CVE-2021-33032 is a critical-severity vulnerability rated 10/10 on the CVSS scale. A Remote Code Execution (RCE) vulnerability in the WebUI component of the eQ-3 HomeMatic CCU2 firmware up to and including version 2.57.5 and CCU3 firmware up to and including version 3.57.5 allows remote unauthenticated attackers to execute system commands as root via a simple HTTP request.. EPSS estimates a 52.16% chance of exploitation in the next 30 days.

Description

A Remote Code Execution (RCE) vulnerability in the WebUI component of the eQ-3 HomeMatic CCU2 firmware up to and including version 2.57.5 and CCU3 firmware up to and including version 3.57.5 allows remote unauthenticated attackers to execute system commands as root via a simple HTTP request.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

52.16%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Eq-3	Homematic Ccu2 Firmware	<= 2.57.5
Eq-3	Homematic Ccu3 Firmware	<= 3.57.5

References

https://novag.github.io/posts/homematic-unauthenticated-remote-code-execution/Exploit, Third Party Advisory
https://www.eq-3.de/downloads/software/HM-CCU2-Firmware_Updates/HM-CCU-2.59.7/HM-CCU2-Changelog.2.59.7.pdfRelease Notes, Vendor Advisory
https://www.eq-3.de/downloads/software/firmware/ccu3-firmware/CCU3-Changelog.3.59.6.pdfRelease Notes, Vendor Advisory
https://novag.github.io/posts/homematic-unauthenticated-remote-code-execution/Exploit, Third Party Advisory
https://www.eq-3.de/downloads/software/HM-CCU2-Firmware_Updates/HM-CCU-2.59.7/HM-CCU2-Changelog.2.59.7.pdfRelease Notes, Vendor Advisory
https://www.eq-3.de/downloads/software/firmware/ccu3-firmware/CCU3-Changelog.3.59.6.pdfRelease Notes, Vendor Advisory

Timeline

Published: Jul 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33032?

How severe is CVE-2021-33032?

CVE-2021-33032 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 52.16% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33032?

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-2021-33032?

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

Scan your code now

Source: NVD / NIST