CVE-2019-19101: Incomplete communication encryption and validation in B&R Automation Studio upgrade service

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-29 · updated 2026-06-17
Weakness: CWE-326

Description

A missing secure communication definition and an incomplete TLS validation in the upgrade service in B&R Automation Studio versions 4.0.x, 4.1.x, 4.2.x, < 4.3.11SP, < 4.4.9SP, < 4.5.5SP, < 4.6.4 and < 4.7.2 enable unauthenticated users to perform MITM attacks via the B&R upgrade server.

Affected products

B&R Industrial Automation Automation Studio: from 4.0 through 4.0.29.87; from 4.1 through 4.1.17.113; from 4.2 through 4.2.14.119; from 4.3 before 4.3.11; from 4.4 before 4.4.9; from 4.5 before 4.5.5 — fixed in 4.3.11, 4.4.9, 4.5.5, 4.6.4, 4.7.2

How to fix

Upgrade to a fixed version: B&R Industrial Automation Automation Studio 4.3.11, 4.4.9, 4.5.5, 4.6.4. Check the vendor advisory for mitigations.

References

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