Denial of service vulnerability on Automation Runtime webserver
Priority LOW 39CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.00961 61st percentileScored 2026-11-07
Fix Fixed Automation Runtime webserver (B&R Automation): 4.91
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| B&R Industrial Automation | Automation Runtime webserver | before 4.91 | 4.91 | Patch available | CNA |
- Automation Runtime webserver VendorB&R Industrial Automation Affected before 4.91 Fixed in 4.91 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:br-automation:automation_runtime:*:*:*:*:*:*:*:* | before 4.91 | Vulnerable | B&R Industrial Automation |
- cpe:2.3:a:br-automation:automation_runtime:*:*:*:*:*:*:*:* Versions before 4.91 Vulnerable ·B&R Industrial Automation
Remediation
- Fix · CNA Automation Runtime webserver (B&R Automation) Fixed in 4.91
Timeline
- 2026-10-02 Threatist record created from CVE-2021-22275
- 2026-10-03 Alias added: GHSA-r593-v4g4-3636
References
More B&R Industrial Automation Automation Runtime vulnerabilities
- TI-2024-00297 FTP uses unsecure encryption mechanisms CVSS 3.1CRITICAL 9.8
- TI-2023-03038 Resource allocation without limits in B&R Automation Runtime CVSS 3.1HIGH 8.6
- TI-2019-13790 B&R Automation Runtime SNMP Authentication and Authorization Weakness CVSS 3.1CRITICAL 9.4
- TI-2024-05377 Diffie-Hellman groups with insufficient strength used in SSL/TLS stack of B&R Automation Runtime CVSS 4.0HIGH 8.3
- TI-2020-09337 Automation Runtime TFTP Service DoS Vulnerability CVSS 3.1HIGH 7.5
- TI-2022-03925 Reflected Cross-Site Scripting Vulnerabilities in Automation Runtime CVSS 3.1MEDIUM 6.1
Sources
- CVE-2021-22275 · CVE Program
- CVE-2021-22275 · NVD
- FIRST EPSS
- GHSA-r593-v4g4-3636 · GitHub Advisory Database · CC BY 4.0
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