Is CVE-2019-10121 in the CISA KEV catalog?

No. CVE-2019-10121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-10121?

CVE-2019-10121 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2019-10121?

CVE-2019-10121 has an EPSS score of 4.63% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-10121?

Upgrade ccu2 firmware to 2.41.8 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-10121

CRITICALEPSS 91th pctl

9.8

CVSS v3

NVD

Description

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.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

ccu2 firmwareNVD

Affected:< 2.41.8Fixed in:2.41.8CVE-2019-10121derived from NVD

ccu3 firmwareNVD

Affected:< 3.43.15Fixed in:3.43.15CVE-2019-10121derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.63%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory2

Other references1

os-s.de

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.