# CVE-2020-17366: Security feature bypass in n/a

> Attackers can bypass RPKI validation or cause denial of service by withholding ROA or CRL files from the relying party.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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:** 5 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fgpw-q4c2-rrgc

## What is CVE-2020-17366?

CVE-2020-17366 is a high-severity vulnerability in n/a, published on 5 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in NLnet Labs Routinator 0.1.0 through 0.7.1. It allows remote attackers to bypass intended access restrictions or to cause a denial of service on dependent routing systems by strategically withholding RPKI Route Origin Authorisation ".roa" files or X509 Certificate Revocation List files from the RPKI relying party's view.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2020-17366?

It affects 1 product.


Products: Nlnetlabs Routinator.

## How do I fix CVE-2020-17366?

No fix has been published for CVE-2020-17366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-17366 being exploited?

There is no known exploitation of CVE-2020-17366 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-39916](https://insights.sbomify.com/CVE-2023-39916/): Possible path traversal when storing RRDP responses (critical 9.3)
- [CVE-2026-49235](https://insights.sbomify.com/CVE-2026-49235/): Routinator crashes on specifically crafted RRDP XML files (high 8.7)
- [CVE-2026-49233](https://insights.sbomify.com/CVE-2026-49233/): Routinator cache path traversal using rogue rsync URIs (high 8.3)
- [CVE-2026-49234](https://insights.sbomify.com/CVE-2026-49234/): Routinator crashes on specifically crafted ASN strings in the API (high 8.2)
- [CVE-2023-39915](https://insights.sbomify.com/CVE-2023-39915/): Crashes on parsing certain invalid RPKI objects (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-17366 and fix it if it is affected.

What it is: CVE-2020-17366 is a high-severity vulnerability in n/a, published on 5 Aug 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-2020-17366 in the wild and no public exploit code.

Affected product: n/a. 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-2020-17366/ (Markdown: https://insights.sbomify.com/CVE-2020-17366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-17366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-17366
- OSV: https://osv.dev/vulnerability/CVE-2020-17366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-17366/
Summaries are generated and may contain mistakes; the official description above is the record.