How severe is CVE-2021-33032?

CVE-2021-33032 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33032 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 52% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33032?

CVE-2021-33032 primarily affects Eq-3 Homematic Ccu2 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33032?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-33032 published?

CVE-2021-33032 was published on 2021-07-22 and last updated on 2026-06-17.

CVE-2021-33032

CVE-2021-33032 is a critical-severity vulnerability in Eq-3 Homematic Ccu2 Firmware with a CVSS 3.x base score of 10.0. Its EPSS exploit-prediction score of 52% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 10.0
EPSS exploit prediction: 52% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Eq-3 Homematic Ccu2 Firmware
Published: 2021-07-22
Last modified: 2026-06-17

Description

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 root via a simple HTTP request.

Frequently asked questions

What is CVE-2021-33032?: 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 root via a simple HTTP request.
How severe is CVE-2021-33032?: CVE-2021-33032 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33032 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 52% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33032?: CVE-2021-33032 primarily affects Eq-3 Homematic Ccu2 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33032?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-33032 published?: CVE-2021-33032 was published on 2021-07-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:eq-3:homematic_ccu2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:eq-3:homematic_ccu3_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Eq-3 Homematic Ccu2 Firmware

CVE-2020-12834 — Critical (CVSS 9.8): eQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the…
CVE-2019-18939 — Critical (CVSS 9.8): eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the HM-Print AddOn through 1.2a installed allow Remote Code Execution…
CVE-2019-18938 — Critical (CVSS 9.8): eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the E-Mail AddOn through 1.6.8.c installed allow Remote Code…
CVE-2019-18937 — Critical (CVSS 9.8): eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the Script Parser AddOn through 1.8 installed allow Remote Code…
CVE-2019-16199 — Critical (CVSS 9.8): eQ-3 Homematic CCU2 before 2.47.18 and CCU3 before 3.47.18 allow Remote Code Execution by unauthenticated attackers…
CVE-2019-9585 — Critical (CVSS 9.8): eQ-3 Homematic CCU2 prior to 2.47.10 and CCU3 prior to 3.47.10 JSON API has Improper Access Control for…

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