What is CVE-2019-10122?

CVE-2019-10122 is a critical-severity vulnerability in Eq-3 Ccu2, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-07-10.

How severe is CVE-2019-10122?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Eq-3 Ccu2

CVE-2019-10122

eQ-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 HMCCU-179. This may lead to remote code execution.

Vulnerability class: Buffer Overflow

Published 2019-07-10 · last modified 2026-06-17.

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: 0.041 (90.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

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)

Frequently asked questions

What is CVE-2019-10122?: CVE-2019-10122 is a critical-severity vulnerability in Eq-3 Ccu2, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-07-10.
How severe is CVE-2019-10122?: Critical severity. CVSS v3 base score is 9.8 out of 10.