# CVE-2021-46671: Information disclosure in n/a

> A remote attacker can read server-side /etc/group data due to an out-of-bounds read in the atftp TFTP server.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** Yes
- **Published:** 4 Feb 2022
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-46671, DLA-3028-1, GHSA-8982-hm8r-945r, SUSE-SU-2022:0881-1, UBUNTU-CVE-2021-46671

## What is CVE-2021-46671?

CVE-2021-46671 is a medium-severity vulnerability in Debian Debian Linux, published on 4 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

options.c in atftp before 0.7.5 reads past the end of an array, and consequently discloses server-side /etc/group data to a remote client.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-46671?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `atftp` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 0.7.0-160.14.1 |
| `atftp` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 0.7.0-160.14.1 |

Products: Atftp Project Atftp, Debian Debian Linux.

## How do I fix CVE-2021-46671?

Upgrade to a fixed version.

## Is CVE-2021-46671 being exploited?

There is no known exploitation of CVE-2021-46671 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2019-11365](https://insights.sbomify.com/CVE-2019-11365/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-41054](https://insights.sbomify.com/CVE-2021-41054/): Memory corruption in n/a (high 7.5)
- [CVE-2020-6097](https://insights.sbomify.com/CVE-2020-6097/): Denial of service in atftpd (high 7.5)
- [CVE-2019-11366](https://insights.sbomify.com/CVE-2019-11366/): Null dereference in n/a (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-46671 and fix it if it is affected.

What it is: CVE-2021-46671 is a medium-severity vulnerability in Debian Debian Linux, published on 4 Feb 2022. 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-2021-46671 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2021-46671/ (Markdown: https://insights.sbomify.com/CVE-2021-46671/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-46671
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-46671
- OSV: https://osv.dev/vulnerability/CVE-2021-46671

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-46671/
Summaries are generated and may contain mistakes; the official description above is the record.