CVE-2019-18939: Eq-3 Homematic CCU2 Firmware

Critical severity, CVSS 9.8. EPSS: 40.8% chance of exploitation in the next 30 days.

eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the HM-Print AddOn through 1.2a installed allow Remote Code Execution by unauthenticated attackers with access to the web interface via the exec.cgi and exec1.cgi scripts, which execute TCL script content from an HTTP POST request.

Affected products

• Eq-3 Homematic CCU2 Firmware: version 2.47.20 only
• Eq-3 Homematic CCU3 Firmware: version 3.47.18 only
• Hm-Print Project Hm-Print: version 1.2a only; version 1.2 only

Published 2019-11-14. Last modified 2026-06-17.