Beckhoff TwinCAT Malformed UDP Packet Improper Resource Shutdown or Release (CVE-2019-5636)

high Tenable OT Security Plugin ID 500343

Synopsis

The remote OT asset is affected by a vulnerability.

Description

When a Beckhoff TwinCAT Runtime receives a malformed UDP packet, the ADS Discovery Service shuts down. Note that the TwinCAT devices are still performing as normal. This issue affects TwinCAT 2 version 2304 (and prior) and TwinCAT 3.1 version 4204.0 (and prior).

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: High

ID: 500343

Version: 1.4

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 9/12/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2019-5636

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/a:beckhoff:twincat:3.1:build4024.0, cpe:/a:beckhoff:twincat:2.0:build2304

Required KB Items: Tenable.ot/Beckhoff

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/21/2019

Vulnerability Publication Date: 11/21/2019

Reference Information

CVE: CVE-2019-5636

CWE: 404

Detections

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