CVE-2021-22275

Denial of service vulnerability on Automation Runtime webserver

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.

Remediation

Workaround:

  • B&R recommends the following specific workarounds and mitigations: The access to the Automation Runtime webserver should be restricted to legitimate network partners, using e.g. a sufficient Firewall setup and robust network segmentation. B&R recommends deactivating Automation Runtime webserver when not needed.

Category

8.6
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.63%
Vendor Advisory br-automation.com
Affected: B&R Automation Automation Runtime webserver
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2021-22275?
CVE-2021-22275 has been scored as a high severity vulnerability.
How to fix CVE-2021-22275?
As a workaround for remediating CVE-2021-22275: B&R recommends the following specific workarounds and mitigations: The access to the Automation Runtime webserver should be restricted to legitimate network partners, using e.g. a sufficient Firewall setup and robust network segmentation. B&R recommends deactivating Automation Runtime webserver when not needed.
Is CVE-2021-22275 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-22275 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22275?
CVE-2021-22275 affects B&R Automation Automation Runtime webserver.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.