What’s Vulnerable › Vulnerabilities

CVE-2021-33032

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 52.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-22 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• Eq-3 Homematic Ccu2 Firmware: through 2.57.5
• Eq-3 Homematic Ccu3 Firmware: through 3.57.5

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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