CVE-2019-5636

mediumpriority · track · 30EPSS 0.014 · 73 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.43% (73rd) EPSS

CVSS 5 · medium

Is it mine?

6 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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).

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · cve@rapid7.comexploitability 3.9 · impact 1.4

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-404USprimaryCWE-20US

affected products (6)

Products and version ranges known to be affected.

Beckhoff TwinCAT 2≤ 2304 ≤2304enisa_euvdEU
Beckhoff TwinCAT 3.1≤ 4204.0 ≤4204.0enisa_euvdEU
Beckhoff Automation GmbH & Co. KG TwinCAT≤ 3.1 Build 4024.0fstec_bduRU
Beckhoff Automation GmbH & Co. KG TwinCAT≤ 2 Build 2304fstec_bduRU
beckhoff twincat= 2.0nvdUScpe:2.3:a:beckhoff:twincat:*:*:*:*:*:*:*:*
beckhoff twincat= 3.1nvdUScpe:2.3:a:beckhoff:twincat:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2019-11-21modified 2026-06-17

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+2019 more

references (7)

External citations — patches, advisories, analysis.

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