# CVE-2023-0158: Triggered crash on direct RRDP access

> Remote attackers can crash the Krill RPKI server by accessing specific RRDP directories, causing service unavailability.

- **Severity:** High 7.5 (`CVSS:3.1/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:** No
- **Published:** 17 Jan 2023
- **Updated:** 4 Apr 2025
- **Also known as:** GHSA-4rq4-8r9h-8884

## What is CVE-2023-0158?

CVE-2023-0158 is a high-severity denial of service vulnerability in NLnet Labs Krill, published on 17 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NLnet Labs Krill supports direct access to the RRDP repository content through its built-in web server at the "/rrdp" endpoint. Prior to 0.12.1 a direct query for any existing directory under "/rrdp/", rather than an RRDP file such as "/rrdp/notification.xml" as would be expected, causes Krill to crash. If the built-in "/rrdp" endpoint is exposed directly to the internet, then malicious remote parties can cause the publication server to crash. The repository content is not affected by this, but the availability of the server and repository can cause issues if this attack is persistent and is not mitigated.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2023-0158?

It affects 1 product.


Products: Nlnetlabs Krill.

## How do I fix CVE-2023-0158?

No fix has been published for CVE-2023-0158 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-0158 being exploited?

There is no known exploitation of CVE-2023-0158 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0158 and fix it if it is affected.

What it is: CVE-2023-0158 is a high-severity denial of service vulnerability in NLnet Labs Krill, published on 17 Jan 2023. 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-2023-0158 in the wild and no public exploit code.

Affected product: NLnet Labs Krill. 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-2023-0158/ (Markdown: https://insights.sbomify.com/CVE-2023-0158/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0158
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0158
- OSV: https://osv.dev/vulnerability/CVE-2023-0158

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0158/
Summaries are generated and may contain mistakes; the official description above is the record.