Beckhoff TwinCAT supports communication over ADS.

published 2018-06-27 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-7910

cvss: 9.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

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.

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	6.4	AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

ICS-CERT Beckhoff TwinCAT

Classification

Weakness

CWE-285 Improper Authorization
CWE-326 Inadequate Encryption Strength

References

download.beckhoff.com /download/Document/product-security/Advisories/advisory-2017-001.pdf
vendor-advisory

Sources

CVE List CVE-2017-16726
NVD CVE-2017-16726

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary