What is CVE-2020-20741?

CVE-2020-20741 is a critical-severity vulnerability in Beckhoff Cx9020. CVSS score: 9.8/10. Published 2021-07-23.

How severe is CVE-2020-20741?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Beckhoff Cx9020

CVE-2020-20741

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.

Published 2021-07-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Beckhoff Cx9020 — versions 6.02

References

download.beckhoff.com/download/Document/product-security/Advisories/advisory-20… (Patch, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2020-20741?: CVE-2020-20741 is a critical-severity vulnerability in Beckhoff Cx9020. CVSS score: 9.8/10. Published 2021-07-23.
How severe is CVE-2020-20741?: Critical severity. CVSS v3 base score is 9.8 out of 10.