CVE-2020-20741

Name: CVE-2020-20741
Creator: NVD / NIST
Published: 2021-07-23T20:15:08.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.56%

Last modified Jun 17, 2026

CVE-2020-20741 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Incorrect Access Control in Beckhoff Automation GmbH & Co. KG CX9020 with firmware version CX9020_CB3011_WEC7_HPS_v602_TC31_B4016.6 allows remote attackers to bypass authentication via the "CE Remote Display Tool" as it does not close the incoming connection on the Windows CE side if the credentials are incorrect.. EPSS estimates a 1.56% chance of exploitation in the next 30 days.

Description

Incorrect Access Control in Beckhoff Automation GmbH & Co. KG CX9020 with firmware version CX9020_CB3011_WEC7_HPS_v602_TC31_B4016.6 allows remote attackers to bypass authentication via the "CE Remote Display Tool" as it does not close the incoming connection on the Windows CE side if the credentials are incorrect.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.56%

72.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Beckhoff	Cx9020	6.02	Build 4016.6

References

https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-006.pdfMitigation, Patch, Vendor Advisory
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-006.pdfMitigation, Patch, Vendor Advisory

Timeline

Published: Jul 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20741?

How severe is CVE-2020-20741?

CVE-2020-20741 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20741?

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-2020-20741?

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

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Source: NVD / NIST