CVE-2017-16726 — Beckhoff TwinCAT supports communication over ADS

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CRITICAL

Beckhoff TwinCAT supports communication over ADS

Published Jun 27, 2018

9.1

CRITICAL

CVSS 3.0

EPSS 0.51%

Description

Beckhoff TwinCAT supports communication over ADS. ADS is a protocol for industrial automation in protected environments. ADS has not been designed to achieve security purposes and therefore does not include any encryption algorithms because of their negative effect on performance and throughput. An attacker can forge arbitrary ADS packets when legitimate ADS traffic is observable.

Affected products

Vendor Ics-Cert Product Beckhoff TwinCAT Default
n/a
- Version
  Version 2, Version 3
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Ics-Cert

Beckhoff TwinCAT

n/a

Version	Status	Constraints
Version 2, Version 3	affected	-

Remediation

No remediation recorded yet.

Metrics

0.51% 0.00508

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00508

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 (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.51% (0.00508)	41.16th	v5 (v2026.06.15)
Sep 20, 2026	0.51% (0.00508)	42.35th	v5 (v2026.06.15)
Jul 20, 2024	0.11% (0.00107)	43.84th	v3 (v2023.03.01)
Jun 28, 2024	0.11% (0.00107)	43.71th	v3 (v2023.03.01)
Mar 7, 2023	0.11% (0.00107)	41.69th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.42% (0.00416)	10.04th	v5 (v2026.06.15)
Apr 14, 2021	0.42% (0.00416)	0.00th	v1