CVE-2021-33032
10.0
CRITICAL · CVSS 3.1 · EPSS 52.2% (pctl 99)
Patch early
EPSS 52.2% — above the 10% action threshold.
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.
Scoring
| CVSS | 10.0 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 52.16% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-07-22 |
| Last modified | 2026-06-17 |
Affected (4)
| Vendor | Product |
|---|---|
| eq-3 | homematic ccu2 |
| eq-3 | homematic ccu2 firmware |
| eq-3 | homematic ccu3 |
| eq-3 | homematic ccu3 firmware |
References
- https://novag.github.io/posts/homematic-unauthenticated-remote-code-execution/
- https://www.eq-3.de/downloads/software/HM-CCU2-Firmware_Updates/HM-CCU-2.59.7/HM-CCU2-Changelog.2.59.7.pdf
- https://www.eq-3.de/downloads/software/firmware/ccu3-firmware/CCU3-Changelog.3.59.6.pdf
- https://novag.github.io/posts/homematic-unauthenticated-remote-code-execution/
- https://www.eq-3.de/downloads/software/HM-CCU2-Firmware_Updates/HM-CCU-2.59.7/HM-CCU2-Changelog.2.59.7.pdf
- https://www.eq-3.de/downloads/software/firmware/ccu3-firmware/CCU3-Changelog.3.59.6.pdf
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