Auth bypass in Eq-3 Ccu2
CVE-2019-10121
eQ-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 attacker can obtain a session ID via the user authentication dialogue, aka HMCCU-153. This leads to automatic login as admin.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.046 (91.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.eq-3.de/Downloads/Software/HM-CCU2-Firmware_Updates/HM-CCU-2.41.9/HM-CCU2-C… (Release Notes, Vendor Advisory)
- www.eq-3.de/Downloads/Software/CCU3-Firmware/CCU3-3.43.16/CCU3-Changelog.3.43.1… (Release Notes, Vendor Advisory)
- os-s.de/advisories/OSS-2018-01.pdf (Broken Link)
Frequently asked questions
- What is CVE-2019-10121?
- CVE-2019-10121 is a critical-severity vulnerability in Eq-3 Ccu2, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2019-07-10.
- How severe is CVE-2019-10121?
- Critical severity. CVSS v3 base score is 9.8 out of 10.