DLL Hijacking Vulnerability in Automation Studio

published 2024-05-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9426

cvss: 7.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits: 0; none known

Improper DLL loading algorithms in B&R Automation Studio versions >=4.0 and <4.12 may allow an authenticated local attacker to execute code in the context of the product.

Patch / fix

fixed in 2

B&R Industrial Automation Automation Studio 4.12
br-automation automation_studio 4.12

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-05-16)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.2	CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

Affected products

B&R Industrial Automation Automation Studio
br-automation automation_studio

Classification

Weakness

CWE-20 Improper Input Validation
CWE-427 Uncontrolled Search Path Element

References

br-automation.com /fileadmin/2021-10_DLL_Hijacking_Vulnerability_in_Automation_Studio-7dd34511.pdf
vendor-advisory

Sources

CVE List CVE-2021-22280
NVD CVE-2021-22280

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary