Beckhoff TwinCAT Discovery Service Denial of Service
Published Nov 21, 2019
7.5
HIGHCVSS 3.1
EPSS 1.43%
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).
Affected products
-
- Version 2304StatusaffectedConstraints<=2304
- Version
-
- Version 4204.0StatusaffectedConstraints<=4204.0
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Beckhoff | TwinCAT 2 | n/a |
| ||||||
| Beckhoff | TwinCAT 3.1 | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.43% (0.01427) | 72.03th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.43% (0.01427) | 71.78th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.13% (0.00134) | 49.15th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.13% (0.00134) | 48.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00134) | 46.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.50% (0.04499) | 74.08th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v1 |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Jan 5, 2022 | 0.62% (0.00624) | 46.35th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (2)
- https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/ x_refsource_MISCExploitThird Party Advisory
- https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/ | x_refsource_MISCExploitThird Party Advisory | |
| https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.