# CVE-2021-22281: Zip Slip Vulnerability in B&R Automation Studio Project Import

> Attackers can exploit a Zip Slip vulnerability in B&R Automation Studio to write files outside the intended directory during project import.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Feb 2024
- **Updated:** 21 Aug 2024
- **Also known as:** GHSA-p434-7834-2w5x

## What is CVE-2021-22281?

CVE-2021-22281 is a medium-severity path traversal vulnerability in B&R Industrial Automation Automation Studio, published on 2 Feb 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

: Relative Path Traversal vulnerability in B&R Industrial Automation Automation Studio allows Relative Path Traversal.This issue affects Automation Studio: from 4.0 through 4.12.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2021-22281?

It affects 1 product.


Products: Br-Automation Automation Studio.

## How do I fix CVE-2021-22281?

No fix has been published for CVE-2021-22281 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22281 being exploited?

There is no known exploitation of CVE-2021-22281 in the wild and no public exploit code.

## Other vulnerabilities in B&R Industrial Automation Automation Studio

- [CVE-2024-0220](https://insights.sbomify.com/CVE-2024-0220/): B&R products use insufficient communication encryption (high 8.3)
- [CVE-2021-22282](https://insights.sbomify.com/CVE-2021-22282/): RCE in B&R Automation Studio with crafted project files (high 8.3)
- [CVE-2020-24681](https://insights.sbomify.com/CVE-2020-24681/): Automation Studio and PVI Multiple incorrect permission assignments for services (high 8.2)
- [CVE-2019-19100](https://insights.sbomify.com/CVE-2019-19100/): Privilege escalation via B&R Automation Studio upgrade service (high 7.5)
- [CVE-2021-22280](https://insights.sbomify.com/CVE-2021-22280/): DLL Hijacking Vulnerability in Automation Studio (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22281 and fix it if it is affected.

What it is: CVE-2021-22281 is a medium-severity path traversal vulnerability in B&R Industrial Automation Automation Studio, published on 2 Feb 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-22281 in the wild and no public exploit code.

Affected product: B&R Industrial Automation Automation Studio. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-22281/ (Markdown: https://insights.sbomify.com/CVE-2021-22281/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22281
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22281
- OSV: https://osv.dev/vulnerability/CVE-2021-22281

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22281/
Summaries are generated and may contain mistakes; the official description above is the record.