# CVE-2021-34997: File upload in CommCell

> Remote attackers can bypass authentication to upload arbitrary files and execute code on Commvault CommCell servers.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jan 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-445g-h2v6-5fxw

## What is CVE-2021-34997?

CVE-2021-34997 is a high-severity vulnerability in Commvault CommCell, published on 13 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell 11.22.22. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the AppStudioUploadHandler class. The issue results from the lack of proper validation of user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this vulnerability to execute code in the context of NETWORK SERVICE. Was ZDI-CAN-13894.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2021-34997?

It affects 1 product.


Products: Commvault Commcell.

## How do I fix CVE-2021-34997?

No fix has been published for CVE-2021-34997 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34997 being exploited?

There is no known exploitation of CVE-2021-34997 in the wild and no public exploit code.

## Other vulnerabilities in Commvault CommCell

- [CVE-2021-34993](https://insights.sbomify.com/CVE-2021-34993/): Auth bypass in CommCell (critical 9.8)
- [CVE-2021-34994](https://insights.sbomify.com/CVE-2021-34994/): Code injection in CommCell (high 8.8)
- [CVE-2021-34995](https://insights.sbomify.com/CVE-2021-34995/): File upload in CommCell (high 8.8)
- [CVE-2021-34996](https://insights.sbomify.com/CVE-2021-34996/): Command injection in CommCell (high 8.8)
- [CVE-2020-25780](https://insights.sbomify.com/CVE-2020-25780/): Path traversal in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34997 and fix it if it is affected.

What it is: CVE-2021-34997 is a high-severity vulnerability in Commvault CommCell, published on 13 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-34997 in the wild and no public exploit code.

Affected product: Commvault CommCell. 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-2021-34997/ (Markdown: https://insights.sbomify.com/CVE-2021-34997/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34997
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34997
- OSV: https://osv.dev/vulnerability/CVE-2021-34997

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34997/
Summaries are generated and may contain mistakes; the official description above is the record.