# CVE-2020-35216: An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false member down event messages.

> Attackers can cause denial of service in Atomix by sending false member down event messages, exploiting a race condition.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/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:** No
- **Published:** 16 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-6vvh-5794-vpmj

## What is CVE-2020-35216?

CVE-2020-35216 is a medium-severity vulnerability in n/a, published on 16 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false member down event messages.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2020-35216?

2 open source packages ship an affected version, including io.atomix:atomix. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `io.atomix:atomix` | Maven | All versions to 3.1.5 | None |
| `io.atomix:atomix` | Maven | All versions to 3.1.5 | None |

Products: Atomix Atomix.

## How do I fix CVE-2020-35216?

No fix has been published for CVE-2020-35216 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35216 being exploited?

There is no known exploitation of CVE-2020-35216 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-35213](https://insights.sbomify.com/CVE-2020-35213/): An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false link event messages sent to a master ONOS node. (high 8.1)
- [CVE-2020-35214](https://insights.sbomify.com/CVE-2020-35214/): An issue in Atomix v3.1.5 allows a malicious Atomix node to remove states of ONOS storage via abuse of primitive operations. (high 8.1)
- [CVE-2020-35209](https://insights.sbomify.com/CVE-2020-35209/): An issue in Atomix v3.1.5 allows unauthorized Atomix nodes to join a target cluster via providing configuration information. (high 7.5)
- [CVE-2020-35211](https://insights.sbomify.com/CVE-2020-35211/): An issue in Atomix v3.1.5 allows unauthorized Atomix nodes to become the lead node. (high 7.5)
- [CVE-2020-35210](https://insights.sbomify.com/CVE-2020-35210/): A vulnerability in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via a Raft session flooding attack using Raft OpenSessionRequest messages. (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35216 and fix it if it is affected.

What it is: CVE-2020-35216 is a medium-severity vulnerability in n/a, published on 16 Dec 2021. 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-2020-35216 in the wild and no public exploit code.

Affected packages and fixed versions:
- io.atomix:atomix (Maven): affected all versions up to 3.1.5; no fix listed
- io.atomix:atomix (Maven): affected all versions up to 3.1.5; no fix listed

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-2020-35216/ (Markdown: https://insights.sbomify.com/CVE-2020-35216/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35216
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35216
- OSV: https://osv.dev/vulnerability/CVE-2020-35216

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35216/
Summaries are generated and may contain mistakes; the official description above is the record.