CVE-2020-27263

Name: CVE-2020-27263
Creator: NVD / NIST
Published: 2021-01-14T00:15:13.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 4.94%

Last modified Jun 17, 2026

CVE-2020-27263 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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, 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.. EPSS estimates a 4.94% chance of exploitation in the next 30 days.

Description

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, 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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

4.94%

91.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ge	Industrial Gateway Server	7.66
Ge	Industrial Gateway Server	7.68.804
Ptc	Kepware Kepserverex	6.0
Ptc	Kepware Kepserverex	6.9
Ptc	Opc-Aggregator	All versions
Ptc	Thingworx Industrial Connectivity	All versions
Ptc	Thingworx Kepware Server	6.8
Ptc	Thingworx Kepware Server	6.9
Rockwellautomation	Kepserver Enterprise	6.6.504.0
Rockwellautomation	Kepserver Enterprise	6.9.572.0
Softwaretoolbox	Top Server	>= 6.0, <= 6.9

References

https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02Third Party Advisory, US Government Resource

Timeline

Published: Jan 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27263?

How severe is CVE-2020-27263?

CVE-2020-27263 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 4.94% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27263?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27263?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST