CVE-2020-12834

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 11.1%, top 5% 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
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 11%CVSS: 9.8Exploit: NoneExposed: 0

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

eQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the JSON API Method ReGa.runScript, by unauthenticated attackers with access to the web interface, due to the default auto-login feature being enabled during first-time setup (or factory reset).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
95.5%
KEV
Not listed

Published

May 15, 2020

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jun 24, 2026
No patch confirmed yet.
generic

CVE-2020-12834 eQ-3 Homematic CCU2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in JSON API Method ReGa.runScript by unauthenticated attackers with access to the web interface due to default auto-login feature enabled during first-time setup (or factory reset) – psytester – Testing is my passion. Sharing knowledge is my contribution.

https://psytester.github.io/CVE-2020-12834/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 40× 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. 2026-07-23 01:49 UTCEG score recompute
  2. 2026-07-22 22:33 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  58. 2026-05-27 13:39 UTCEPSS rescore
  59. 2026-05-27 03:33 UTCEG score recompute
  60. 2026-05-27 03:33 UTCGHSA enrichment
  61. 2026-05-26 13:42 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-12834?
CVE-2020-12834 is a critical vulnerability published on May 15, 2020. eQ-3 Homematic Central Control Unit (CCU)2 through 2.51.6 and CCU3 through 3.51.6 allow Remote Code Execution in the JSON API Method ReGa.runScript, by unauthenticated attackers with access to the web interface, due to the default auto-login feature being enabled during first-time setup (or factory…
When was CVE-2020-12834 disclosed?
CVE-2020-12834 was first published in the National Vulnerability Database on May 15, 2020, 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-2020-12834 actively exploited?
CVE-2020-12834 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-12834?
CVE-2020-12834 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-12834?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12834, 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.

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