Beckhoff TwinCAT 3 supports communication over ADS.

published 2018-06-27 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-7902

cvss: 5.9; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits: 0; none known

Beckhoff TwinCAT 3 supports communication over ADS. ADS is a protocol for industrial automation in protected environments. This protocol uses user configured routes, that can be edited remotely via ADS. This special command supports encrypted authentication with username/password. The encryption uses a fixed key, that could be extracted by an attacker. Precondition of the exploitation of this weakness is network access at the moment a route is added.

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.9	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

ICS-CERT Beckhoff TwinCAT

Classification

Weakness

CWE-522 Insufficiently Protected Credentials
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

download.beckhoff.com /download/Document/product-security/Advisories/advisory-2017-002.pdf
mitigation, vendor-advisory

Sources

CVE List CVE-2017-16718
NVD CVE-2017-16718

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Summary