# CVE-2020-6097: Denial of service in atftpd

> An attacker can cause a denial of service in the atftpd daemon by sending a specially crafted sequence of multicast requests, triggering an assertion failure.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-6097, GHSA-g854-fc3p-gq33, UBUNTU-CVE-2020-6097, openSUSE-SU-2020:1736-1

## What is CVE-2020-6097?

CVE-2020-6097 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 10 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An exploitable denial of service vulnerability exists in the atftpd daemon functionality of atftp 0.7.git20120829-3.1+b1. A specially crafted sequence of RRQ-Multicast requests trigger an assert() call resulting in denial-of-service. An attacker can send a sequence of malicious packets to trigger this vulnerability.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2020-6097?

It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `atftp` | openSUSE:Leap 15.2 | All versions | 0.7.2-lp152.2.3.1 |

Products: Atftp Project Atftp, Debian Debian Linux, Opensuse Leap.

## How do I fix CVE-2020-6097?

Apply the vendor's patch.

## Is CVE-2020-6097 being exploited?

There is no known exploitation of CVE-2020-6097 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-2019-11366](https://insights.sbomify.com/CVE-2019-11366/): Null dereference in n/a (medium 5.9)
- [CVE-2021-46671](https://insights.sbomify.com/CVE-2021-46671/): Information disclosure in n/a (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6097 and fix it if it is affected.

What it is: CVE-2020-6097 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 10 Sep 2020. 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-2020-6097 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-2020-6097/ (Markdown: https://insights.sbomify.com/CVE-2020-6097/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6097
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6097
- OSV: https://osv.dev/vulnerability/CVE-2020-6097

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-6097/
Summaries are generated and may contain mistakes; the official description above is the record.