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Fencer Vulns
critical 9.1

CVE-2020-27267 json

KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all ver…

published 2021-01-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19780

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.0%
EPSS 6.0% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-352-02 updated cvss 7.5

PTC Kepware KEPServerEX (Update A)

  • PTC GE Digital Industrial Gateway Server 7.68.804, 7.66 PTC KEPServerEX >= 6.0, <= 6.9 PTC OPC-Aggregator PTC Rockwell Automation KEPServer Enterprise 6.6.504.0, 6.9.572.0 PTC Software Toolbox TOP Server 6.x PTC ThingWorx Industrial Connectivity
    +1 more products
    PTC ThingWorx Kepware Server 6.8, 6.9
    affected: fixed in 6.9.584.0, mitigation “PTC has released updates for the following products and recommends that users upgrade to the most current supported version:” my.kepware.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

5.99% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Affected products

  • n/a PTC Kepware KEPServerEX
  • n/a ThingWorx Kepware Server
  • n/a ThingWorx Industrial Connectivity
  • n/a OPC-Aggregator
  • n/a Rockwell Automation KEPServer Enterprise
  • n/a GE Digital Industrial Gateway Server
  • n/a Software Toolbox TOP Server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.