CVE-2021-22275: Denial of service vulnerability on Automation Runtime webserver

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-13 · updated 2026-06-17
Weakness: CWE-120

Description

Buffer Overflow vulnerability in B&R Automation Runtime webserver allows an unauthenticated network-based attacker to stop the cyclic program on the device and cause a denial of service.

Affected products

B&R Industrial Automation Automation Runtime: before 4.91 — fixed in 4.91

How to fix

Upgrade to a fixed version: B&R Industrial Automation Automation Runtime 4.91. Check the vendor advisory for mitigations.

References

https://www.br-automation.com/downloads_br_productcatalogue/assets/1625405588264-en-original-1.0.pdf
https://www.br-automation.com/downloads_br_productcatalogue/assets/1625405588264-en-original-1.0.pdf

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