How severe is CVE-2017-16718?

CVE-2017-16718 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-16718 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16718?

CVE-2017-16718 affects Beckhoff Twincat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16718?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-16718 published?

CVE-2017-16718 was published on 2018-06-27 and last updated on 2026-06-17.

CVE-2017-16718

CVE-2017-16718 is a medium-severity vulnerability in Beckhoff Twincat with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Beckhoff Twincat
Published: 2018-06-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2017-16718?: 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.
How severe is CVE-2017-16718?: CVE-2017-16718 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-16718 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16718?: CVE-2017-16718 affects Beckhoff Twincat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16718?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16718 published?: CVE-2017-16718 was published on 2018-06-27 and last updated on 2026-06-17.

References

https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2017-002.pdf

Affected products (1)

cpe:2.3:a:beckhoff:twincat:3.0:*:*:*:*:*:*:*

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