PatchTheCVECVE-2019-10119: eQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.16 use session IDs for authentication b
CVE-2019-10119 is a critical-severity flaw (CVSS 9.8) affecting ccu3 firmware, ccu2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.0% (top 20%) |
| CISA exploited list | No |
| Weakness | CWE-306 |
| Published | 2019-07-10 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-10119?
ccu3 firmware: upgrade to 3.43.16; ccu2 firmware: upgrade to 2.41.8. Exact commands for each OS are on this page.
Is CVE-2019-10119 being exploited?
CVE-2019-10119 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-10119 affect?
CVE-2019-10119 affects ccu3 firmware, ccu2 firmware. Severity is critical (CVSS 9.8). 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
How urgent is CVE-2019-10119?
Priority 59/100. Critical severity; Remotely exploitable, no login, no user action
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- CVE-2019-9726 HIGH 7.5 UPGRADE Directory Traversal / Arbitrary File Read in eQ-3 AG Homematic CCU3 3.43.15 and earlier allows remote attacker
- CVE-2019-14475 HIGH 7.5 UPGRADE UPGRADE eQ-3 Homematic CCU2 2.47.15 and prior and CCU3 3.47.15 and prior use session IDs for authentication but lack a
- CVE-2019-14474 HIGH 7.5 UPGRADE eQ-3 Homematic CCU3 3.47.15 and prior has Improper Input Validation in function 'Call()' of ReGa core logic pr