# CVE-2021-32801: Exceptions may have logged Encryption-at-Rest key content in Nextcloud server

> Attackers with log access can read encryption keys if Encryption-at-Rest is enabled and exceptions are logged, compromising data confidentiality.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mcpf-v65v-359h

## What is CVE-2021-32801?

CVE-2021-32801 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 7 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Nextcloud server is an open source, self hosted personal cloud. In affected versions logging of exceptions may have resulted in logging potentially sensitive key material for the Nextcloud Encryption-at-Rest functionality. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. If upgrading is not an option users are advised to disable system logging to resolve this issue until such time that an upgrade can be performed Note that ff you do not use the Encryption-at-Rest functionality of Nextcloud you are not affected by this bug.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File)

## Which versions are affected by CVE-2021-32801?

It affects 1 product.


Products: Nextcloud Nextcloud Server.

## How do I fix CVE-2021-32801?

Upgrade to a fixed version.

## Is CVE-2021-32801 being exploited?

There is no known exploitation of CVE-2021-32801 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Nextcloud Server

- [CVE-2021-32802](https://insights.sbomify.com/CVE-2021-32802/): Preview generation used third-party library not suited for user-generated content in Nextcloud server (critical 9.3)
- [CVE-2023-26482](https://insights.sbomify.com/CVE-2023-26482/): Scope of workflow operations is not validated in nextcloud server (critical 9.1)
- [CVE-2018-3775](https://insights.sbomify.com/CVE-2018-3775/): Auth bypass in Nextcloud Server (high 8.8)
- [CVE-2023-35172](https://insights.sbomify.com/CVE-2023-35172/): Nextcloud Server password reset endpoint is not brute force protected (high 8.7)
- [CVE-2023-32320](https://insights.sbomify.com/CVE-2023-32320/): Nextcloud Server's brute force protection allows someone to send more requests than intended (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32801 and fix it if it is affected.

What it is: CVE-2021-32801 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 7 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-32801 in the wild and no public exploit code.

Affected product: Nextcloud Nextcloud Server. 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-2021-32801/ (Markdown: https://insights.sbomify.com/CVE-2021-32801/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32801
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32801
- OSV: https://osv.dev/vulnerability/CVE-2021-32801

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32801/
Summaries are generated and may contain mistakes; the official description above is the record.