# CVE-2017-6463: Denial of service in n/a

> Remote authenticated users can crash the NTP daemon by sending an invalid configuration directive, requiring an upgrade to fix.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Mar 2017
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-6463, GHSA-gmrg-j497-5g5q, UBUNTU-CVE-2017-6463

## What is CVE-2017-6463?

CVE-2017-6463 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 27 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote authenticated users to cause a denial of service (daemon crash) via an invalid setting in a :config directive, related to the unpeer option.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2017-6463?

It affects 1 product.


Products: Ntp Ntp.

## How do I fix CVE-2017-6463?

Upgrade to a fixed version.

## Is CVE-2017-6463 being exploited?

There is no known exploitation of CVE-2017-6463 in the wild and no public exploit code.

## Other vulnerabilities in Ntp Ntp

- [CVE-2018-12327](https://insights.sbomify.com/CVE-2018-12327/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-6460](https://insights.sbomify.com/CVE-2017-6460/): Memory corruption in n/a (high 8.8)
- [CVE-2019-11331](https://insights.sbomify.com/CVE-2019-11331/): Other in n/a (high 8.1)
- [CVE-2017-6451](https://insights.sbomify.com/CVE-2017-6451/): Memory corruption in n/a (high 7.8)
- [CVE-2017-6452](https://insights.sbomify.com/CVE-2017-6452/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6463 and fix it if it is affected.

What it is: CVE-2017-6463 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 27 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-6463 in the wild and no public exploit code.

Affected product: Ntp Ntp. 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-2017-6463/ (Markdown: https://insights.sbomify.com/CVE-2017-6463/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6463
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6463
- OSV: https://osv.dev/vulnerability/CVE-2017-6463

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-6463/
Summaries are generated and may contain mistakes; the official description above is the record.