CVE-2020-27267

mediumpriority · track · 38EPSS 0.050 · 92 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

5.00% (92nd) EPSS

CVSS 6.4 · medium

Is it mine?

44 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedGE Digital Industrial Gateway Servercisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedKEPServerEXcisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedOPC-Aggregatorcisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedRockwell Automation KEPServer Enterprisecisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedSoftware Toolbox TOP Servercisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedThingWorx Industrial Connectivitycisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
FixedThingWorx Kepware Servercisa_csaf_ot
OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
https://support.ptc.com/
MitigationGE Digital Industrial Gateway Servercisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationKEPServerEXcisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationOPC-Aggregatorcisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationRockwell Automation KEPServer Enterprisecisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationSoftware Toolbox TOP Servercisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationThingWorx Industrial Connectivitycisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:
MitigationThingWorx Kepware Servercisa_csaf_ot
PTC has released updates for the following products and recommends that users upgrade to the most current supported version:

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.4–9.1

v2.06.4mediumAV:N/AC:L/Au:N/C:P/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 4.9

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.2

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-416USCWE-416USCWE-416US

affected products (44)

Products and version ranges known to be affected.

GE Digital Industrial Gateway Server: v7.68.804 and v7.66all versionscisa_csaf_otUS
KEPServerEX: v6.0 to v6.9all versionscisa_csaf_otUS
OPC-Aggregator: All versionsall versionscisa_csaf_otUS
Rockwell Automation KEPServer Enterprise: v6.6.504.0 and v6.9.572.0all versionscisa_csaf_otUS
Software Toolbox TOP Server: All 6.x versionsall versionscisa_csaf_otUS
ThingWorx Industrial Connectivity: All versionsall versionscisa_csaf_otUS
ThingWorx Kepware Server: v6.8 and v6.9all versionscisa_csaf_otUS
PTC GE Digital Industrial Gateway Serverall versionscisa_csaf_otUS
PTC KEPServerEX6.0 | → 6.9cisa_csaf_otUS
PTC OPC-Aggregatorall versionscisa_csaf_otUS
PTC Rockwell Automation KEPServer Enterpriseall versionscisa_csaf_otUS
PTC Software Toolbox TOP Serverall versionscisa_csaf_otUS
PTC ThingWorx Industrial Connectivityall versionscisa_csaf_otUS
PTC ThingWorx Kepware Serverall versionscisa_csaf_otUS
n/a GE Digital Industrial Gateway Server≤ v7.68.804enisa_euvdEU
n/a GE Digital Industrial Gateway Server≤ v7.66enisa_euvdEU
n/a OPC-Aggregator≤ All versionsenisa_euvdEU
n/a PTC Kepware KEPServerEX≤ v6.0 to v6.9enisa_euvdEU
n/a Rockwell Automation KEPServer Enterprise≤ All versionsenisa_euvdEU
n/a Software Toolbox Top Server≤ All 6.x versionsenisa_euvdEU

showing 20 of 44

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-352-02PTC Kepware KEPServerEX (Update A)2020-12-17icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could lead to a server crashing, a denial-of-service condition, data leakage, or remote code execution.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot NVD CVE.org MITRE

published 2021-01-14modified 2026-06-17

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+16123 more

references (5)

External citations — patches, advisories, analysis.

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