# CVE-2020-5895: Misconfiguration in NGINX Controller

> Local attackers can cause a denial of service in NGINX Controller by writing malformed data to a socket with insecure permissions.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** No
- **Published:** 7 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-359f-64m6-vf7p

## What is CVE-2020-5895?

CVE-2020-5895 is a high-severity vulnerability in NGINX Controller, published on 7 May 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

On NGINX Controller versions 3.1.0-3.3.0, AVRD uses world-readable and world-writable permissions on its socket, which allows processes or users on the local system to write arbitrary data into the socket. A local system attacker can make AVRD segmentation fault (SIGSEGV) by writing malformed messages to the socket.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2020-5895?

It affects 1 product.


Products: F5 Nginx Controller.

## How do I fix CVE-2020-5895?

No fix has been published for CVE-2020-5895 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5895 being exploited?

There is no known exploitation of CVE-2020-5895 in the wild and no public exploit code.

## Other vulnerabilities in NGINX Controller

- [CVE-2020-27730](https://insights.sbomify.com/CVE-2020-27730/): Path traversal in NGINX Controller (critical 9.8)
- [CVE-2020-5901](https://insights.sbomify.com/CVE-2020-5901/): Cross-site scripting in NGINX Controller (critical 9.6)
- [CVE-2020-5900](https://insights.sbomify.com/CVE-2020-5900/): Cross-site request forgery in NGINX Controller (high 8.8)
- [CVE-2020-5863](https://insights.sbomify.com/CVE-2020-5863/): Missing authorization in NGINX Controller (high 8.6)
- [CVE-2020-5894](https://insights.sbomify.com/CVE-2020-5894/): Security feature bypass in NGINX Controller (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5895 and fix it if it is affected.

What it is: CVE-2020-5895 is a high-severity vulnerability in NGINX Controller, published on 7 May 2020. 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-2020-5895 in the wild and no public exploit code.

Affected product: NGINX Controller. 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-2020-5895/ (Markdown: https://insights.sbomify.com/CVE-2020-5895/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5895
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5895
- OSV: https://osv.dev/vulnerability/CVE-2020-5895

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5895/
Summaries are generated and may contain mistakes; the official description above is the record.