Cyber Resilience

CVE-2021-33032

CriticalPublic PoCRCE

Published: 22 July 2021

Published
22 July 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.5021 97.9th percentile
Risk Priority 50 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33032 is a critical-severity OS Command Injection (CWE-78) vulnerability in Eq-3 Homematic Ccu2 Firmware. Its CVSS base score is 10.0 (Critical).

Operationally, ranked in the top 2.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

A Remote Code Execution (RCE) vulnerability in the WebUI component of the eQ-3 HomeMatic CCU2 firmware up to and including version 2.57.5 and CCU3 firmware up to and including version 3.57.5 allows remote unauthenticated attackers to execute system commands as…

more

root via a simple HTTP request.

CWE(s)
CWE-78

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

eq-3
homematic ccu2 firmware
≤ 2.57.5
eq-3
homematic ccu3 firmware
≤ 3.57.5

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References