CVE-2021-33032

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 52.2%, top 1% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
10.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 52%
CISA-KEV: Not listedEPSS: 52%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
70(Track*)
EG Risk 70/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation52% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
98.8%
KEV
Not listed

Published

July 22, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CVE-2021-33032: HomeMatic - Unauthenticated Remote Code Execution | novag's Blog

https://novag.github.io/posts/homematic-unauthenticated-remote-code-execution/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 02:01 UTCEG score recompute
  3. 2026-07-22 22:48 UTCEG score recompute
  4. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-06-27 03:06 UTCEPSS rescore
  2. 2026-06-25 13:48 UTCEPSS rescore
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  4. 2026-06-23 21:31 UTCEPSS rescore
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  6. 2026-06-22 14:24 UTCEPSS rescore
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  8. 2026-06-21 14:55 UTCEPSS rescore
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  11. 2026-06-18 17:51 UTCEPSS rescore
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  17. 2026-06-12 23:10 UTCEPSS rescore
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  19. 2026-06-11 13:58 UTCEPSS rescore
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  22. 2026-06-08 14:15 UTCEPSS rescore
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  24. 2026-06-06 13:46 UTCEPSS rescore
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  27. 2026-06-05 22:45 UTCEPSS rescore
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  30. 2026-06-04 13:10 UTCEPSS rescore
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  36. 2026-05-31 22:29 UTCEPSS rescore
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  40. 2026-05-29 13:42 UTCEPSS rescore
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  42. 2026-05-28 13:43 UTCEPSS rescore
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  44. 2026-05-27 13:39 UTCEPSS rescore
  45. 2026-05-27 13:39 UTCEPSS rescore
  46. 2026-05-27 13:39 UTCEPSS rescore
  47. 2026-05-26 13:42 UTCEPSS rescore
  48. 2026-05-26 13:07 UTCEG score recompute
  49. 2026-05-26 13:07 UTCGHSA enrichment
  50. 2026-05-26 07:17 UTCEPSS rescore
  51. 2026-05-26 07:17 UTCEPSS rescore
  52. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-33032?
CVE-2021-33032 is a critical vulnerability published on July 22, 2021. 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.
When was CVE-2021-33032 disclosed?
CVE-2021-33032 was first published in the National Vulnerability Database on July 22, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-33032 actively exploited?
CVE-2021-33032 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-33032?
CVE-2021-33032 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2021-33032?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33032, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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