Beckhoff CX9020 Authentication Bypass (CVE-2020-20741)

critical Tenable OT Security Plugin ID 500517

Synopsis

The remote OT asset is affected by a vulnerability.

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.

This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: Critical

ID: 500517

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 9/11/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-20741

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:beckhoff:cx9020:6.02:build_4016.6

Required KB Items: Tenable.ot/Beckhoff

Exploit Ease: No known exploits are available

Patch Publication Date: 7/23/2021

Vulnerability Publication Date: 7/23/2021

Reference Information

CVE: CVE-2020-20741

Detections

Analytics