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Vulnerability record · CVE-2019-10119 · published 10 July 2019

CVE-2019-10119: Eq-3 ccu3 firmware missing authentication for critical function vulnerability

Eq 3 · Ccu3 Firmware

eQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.16 use session IDs for authentication but lack authorization checks. An attacker can obtain a session ID via an invalid login attempt to the RemoteApi account, aka HMCCU-154. This leads to automatic login as admin.

9.8 CVSS 3.0 Critical EPSS 2.0% · top 20.5% CWE-306 · Missing authentication for critical function
9.8CVSS 3.0 base score, v2 7.5
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

eQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.16 use session IDs for authentication but lack authorization checks. An attacker can obtain a session ID via an invalid login attempt to the RemoteApi account, aka HMCCU-154. This leads to automatic login as admin.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.eq-3.de/Downloads/Software/CCU3-Firmware/CCU3-3.43.16/CCU3-Changelog.3.43.16.pdf Release NotesVendor Advisory
https://www.eq-3.de/Downloads/Software/HM-CCU2-Firmware_Updates/HM-CCU-2.41.9/HM-CCU2-Changelog.2.41.9.pdf Release NotesVendor Advisory
https://www.eq-3.de/Downloads/Software/CCU3-Firmware/CCU3-3.43.16/CCU3-Changelog.3.43.16.pdf Release NotesVendor Advisory
https://www.eq-3.de/Downloads/Software/HM-CCU2-Firmware_Updates/HM-CCU-2.41.9/HM-CCU2-Changelog.2.41.9.pdf Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-12834Eq-3 homematic ccu2 firmware incorrect default permissions vulnerabilityeQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the JSON API Method ReGa.runScript, …EPSS 11%9.8CVE-2019-10121Eq-3 ccu3 firmware missing authentication for critical function vulnerabilityeQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.15 use session IDs for authentication but lack authorization checks. An attack…EPSS 4.6%9.8CVE-2019-10122Eq-3 ccu3 firmware out-of-bounds write vulnerabilityeQ-3 HomeMatic CCU2 devices before 2.41.9 and CCU3 devices before 3.43.16 have buffer overflows in the ReGa ise GmbH HTTP-Server 2.0 component, aka H…EPSS 4.1%8.8CVE-2019-14423Eq-3 cux-daemon os command injection vulnerabilityA Remote Code Execution (RCE) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 until 2.45.6 allows remote authenticated…EPSS 20%8.8CVE-2019-14473Eq-3 ccu2 firmware missing authorization vulnerabilityeQ-3 Homematic CCU2 and CCU3 use session IDs for authentication but lack authorization checks. Consequently, a valid guest level or user level accoun…EPSS 1.9%8.8CVE-2019-10120Eq-3 ccu3 firmware vulnerabilityOn eQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.16, automatic login configuration (aka setAutoLogin) can be achieved by con…EPSS 1.3%7.5CVE-2019-14474Eq-3 ccu3 firmware improper input validation vulnerabilityeQ-3 Homematic CCU3 3.47.15 and prior has Improper Input Validation in function 'Call()' of ReGa core logic process, resulting in the ability to star…EPSS 1.9%7.5CVE-2019-14475Eq-3 ccu2 firmware missing authorization vulnerabilityeQ-3 Homematic CCU2 2.47.15 and prior and CCU3 3.47.15 and prior use session IDs for authentication but lack authorization checks. An attacker can ob…EPSS 2.0%

Source: NIST National Vulnerability Database (record CVE-2019-10119), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.