# CVE-2021-21528: Information disclosure in PowerScale OneFS

> An attacker can view directory listings during upgrades, potentially exposing sensitive file structure information in Dell PowerScale OneFS.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Nov 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-2x5m-6jx4-jr66

## What is CVE-2021-21528?

CVE-2021-21528 is a high-severity vulnerability in Dell Emc Powerscale Onefs, published on 12 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dell EMC PowerScale OneFS versions 9.1.0, 9.2.0.x, 9.2.1.x contain an Exposure of Information through Directory Listing vulnerability. This vulnerability is triggered when upgrading from a previous versions.

Weakness: CWE-548 (Exposure of Information Through Directory Listing)

## Which versions are affected by CVE-2021-21528?

It affects 1 product.


Products: Dell Emc Powerscale Onefs.

## How do I fix CVE-2021-21528?

No fix has been published for CVE-2021-21528 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21528 being exploited?

There is no known exploitation of CVE-2021-21528 in the wild and no public exploit code.

## Other vulnerabilities in Dell Emc Powerscale Onefs

- [CVE-2021-21502](https://insights.sbomify.com/CVE-2021-21502/): Auth bypass in PowerScale OneFS (critical 9.8)
- [CVE-2022-26851](https://insights.sbomify.com/CVE-2022-26851/): Information disclosure in PowerScale OneFS (critical 9.1)
- [CVE-2021-21506](https://insights.sbomify.com/CVE-2021-21506/): Privilege escalation in PowerScale OneFS (high 8.8)
- [CVE-2023-22575](https://insights.sbomify.com/CVE-2023-22575/): Information disclosure in PowerScale OneFS (high 8.7)
- [CVE-2021-21594](https://insights.sbomify.com/CVE-2021-21594/): Information disclosure in PowerScale OneFS (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21528 and fix it if it is affected.

What it is: CVE-2021-21528 is a high-severity vulnerability in Dell Emc Powerscale Onefs, published on 12 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-21528 in the wild and no public exploit code.

Affected product: Dell Emc Powerscale Onefs. 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-2021-21528/ (Markdown: https://insights.sbomify.com/CVE-2021-21528/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21528
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21528
- OSV: https://osv.dev/vulnerability/CVE-2021-21528

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21528/
Summaries are generated and may contain mistakes; the official description above is the record.