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CVE-2019-5636— Beckhoff TwinCAT Discovery Service Denial of Service

Quick assessment

Affected
Beckhoff TwinCAT 2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Beckhoff TwinCAT是德国Beckhoff公司的一套用于可编程逻辑控制器（PLC）的编程软件。 Beckhoff TwinCAT 2 Build 2304及之前版本和3.1 Build 4024.0及之前版本中存在安全漏洞。攻击者可借助UDP数据包利用该漏洞关闭ADS Discovery服务。

CVSS 5.3 · Medium EPSS 1.43% · P72
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I. Basic Information for CVE-2019-5636

Vulnerability Information
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Vulnerability Title
Beckhoff TwinCAT Discovery Service Denial of Service
Source: CVE Program / CVE List V5
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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Beckhoff TwinCAT 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Beckhoff TwinCAT是德国Beckhoff公司的一套用于可编程逻辑控制器（PLC）的编程软件。 Beckhoff TwinCAT 2 Build 2304及之前版本和3.1 Build 4024.0及之前版本中存在安全漏洞。攻击者可借助UDP数据包利用该漏洞关闭ADS Discovery服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Beckhoff TwinCAT 2 2304 ~ 2304 -
Beckhoff TwinCAT 3.1 4204.0 ~ 4204.0 -

II. Public POCs for CVE-2019-5636

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III. Intelligence Information for CVE-2019-5636

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Security Blog Posts for CVE-2019-5636 (1)

Other References for CVE-2019-5636 (1)

IV. Related Vulnerabilities

Same product: TwinCAT 2
Same vendor: Beckhoff
Same weakness: CWE-404

V. Comments for CVE-2019-5636

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