# CVE-2021-33035: Buffer overflow from a crafted DBF file

> A buffer overflow in Apache OpenOffice allows arbitrary code execution when opening a crafted DBF file.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 23 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-33035, GHSA-p57v-vh5w-35p2

## What is CVE-2021-33035?

CVE-2021-33035 is a high-severity memory corruption vulnerability in Apache Openoffice, published on 23 Sep 2021. 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

Apache OpenOffice opens dBase/DBF documents and shows the contents as spreadsheets. DBF are database files with data organized in fields. When reading DBF data the size of certain fields is not checked: the data is just copied into local variables. A carefully crafted document could overflow the allocated space, leading to the execution of arbitrary code by altering the contents of the program stack. This issue affects Apache OpenOffice up to and including version 4.1.10

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-33035?

It affects 1 product.


Products: Apache Openoffice.

## How do I fix CVE-2021-33035?

Upgrade to a fixed version.

## Is CVE-2021-33035 being exploited?

There is no known exploitation of CVE-2021-33035 in the wild and no public exploit code.

## Other vulnerabilities in Apache Openoffice

- [CVE-2014-3524](https://insights.sbomify.com/CVE-2014-3524/): Command injection in n/a (critical 9.3)
- [CVE-2010-3450](https://insights.sbomify.com/CVE-2010-3450/): Path traversal in n/a (critical 9.3)
- [CVE-2010-3451](https://insights.sbomify.com/CVE-2010-3451/): Use after free in n/a (critical 9.3)
- [CVE-2010-3452](https://insights.sbomify.com/CVE-2010-3452/): Use after free in n/a (critical 9.3)
- [CVE-2010-3453](https://insights.sbomify.com/CVE-2010-3453/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33035 and fix it if it is affected.

What it is: CVE-2021-33035 is a high-severity memory corruption vulnerability in Apache Openoffice, published on 23 Sep 2021. 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-2021-33035 in the wild and no public exploit code.

Affected product: Apache Openoffice. 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-2021-33035/ (Markdown: https://insights.sbomify.com/CVE-2021-33035/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33035
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33035
- OSV: https://osv.dev/vulnerability/CVE-2021-33035

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33035/
Summaries are generated and may contain mistakes; the official description above is the record.