CVE-2019-9583: Eq-3 Homematic CCU2 Firmware

High severity, CVSS 8.2. EPSS: 1.9% chance of exploitation in the next 30 days.

eQ-3 Homematic CCU2 and CCU3 obtain session IDs without login. This allows a Denial of Service and is a starting point for other attacks. Affected versions for CCU2: 2.35.16, 2.41.5, 2.41.8, 2.41.9, 2.45.6, 2.45.7, 2.47.10, 2.47.12, 2.47.15. Affected versions for CCU3: 3.41.11, 3.43.16, 3.45.5, 3.45.7, 3.47.10, 3.47.15.

Affected products

• Eq-3 Homematic CCU2 Firmware: affected versions not specified; version 2.35.16 only; version 2.41.5 only; version 2.41.8 only; version 2.41.9 only; version 2.45.6 only; …
• Eq-3 Homematic CCU3 Firmware: version 3.41.11 only; version 3.43.16 only; version 3.45.5 only; version 3.45.7 only; version 3.47.10 only; version 3.47.15 only

Published 2019-08-14. Last modified 2026-06-17.