CVE-2020-27267

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 4.9% (91st percentile of EPSS-scored CVEs). 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4.9%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all versions), Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server v7.68.804 and v7.66, and Software Toolbox TOP Server all 6.x versions, are vulnerable to a heap-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and potentially leak data.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
47
EG Risk 47/100CISA SSVC

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
Severity91% × 45%
Exploitation5% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.9%
EPSS %ILE
91st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

January 14, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 22, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

PTC Kepware KEPServerEX (Update A) | CISA

PTC Kepware KEPServerEX (Update A) | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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.

Showing the most recent 100 of 146 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 15:17 UTCEG score recompute
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  1. 2026-09-04 13:57 UTCEPSS rescore
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  3. 2026-09-02 14:08 UTCEPSS rescore
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  5. 2026-08-30 19:14 UTCEPSS rescore
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  7. 2026-08-27 14:21 UTCEPSS rescore
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  33. 2026-07-23 14:15 UTCEPSS rescore
  34. 2026-07-23 14:15 UTCEPSS rescore
  35. 2026-07-23 01:52 UTCEG score recompute
  36. 2026-07-22 22:38 UTCEG score recompute
  37. 2026-07-22 14:05 UTCEPSS rescore
  38. 2026-07-21 15:22 UTCEPSS rescore
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  40. 2026-07-20 17:04 UTCEPSS rescore
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  50. 2026-07-13 22:27 UTCEPSS rescore
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  57. 2026-07-09 19:07 UTCEPSS rescore
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  59. 2026-07-07 13:43 UTCEPSS rescore
  60. 2026-07-06 16:25 UTCEPSS rescore
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  69. 2026-06-27 03:06 UTCEPSS rescore
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  71. 2026-06-25 13:48 UTCEPSS rescore
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  74. 2026-06-23 21:31 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-27267?
CVE-2020-27267 is a critical vulnerability published on January 14, 2021. KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all versions), Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server v7.68.804 and v7.66, and Software Toolbox TOP Server all 6.x versions,…
When was CVE-2020-27267 disclosed?
CVE-2020-27267 was first published on January 14, 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-2020-27267 actively exploited?
CVE-2020-27267 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.9% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27267?
CVE-2020-27267 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2020-27267?
A fix for CVE-2020-27267 is available: update to the fixed version the vendor names in its advisory.

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