# CVE-2015-5194: Denial of service in n/a

> Remote attackers can crash the NTP daemon by sending crafted logconfig commands, disrupting time synchronization services.

- **Severity:** High 7.5 (`CVSS:3.0/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:** Yes
- **Published:** 21 Jul 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-5194, GHSA-3263-mvg8-28x9, UBUNTU-CVE-2015-5194

## What is CVE-2015-5194?

CVE-2015-5194 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The log_config_command function in ntp_parser.y in ntpd in NTP before 4.2.7p42 allows remote attackers to cause a denial of service (ntpd crash) via crafted logconfig commands.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2015-5194?

It affects 13 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Ntp Ntp, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Hpc Node, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation, Suse Linux Enterprise Debuginfo, Suse Linux Enterprise Server, Suse Manager, Suse Manager Proxy, Suse Openstack Cloud.

## How do I fix CVE-2015-5194?

Upgrade to a fixed version.

## Is CVE-2015-5194 being exploited?

There is no known exploitation of CVE-2015-5194 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-5194 and fix it if it is affected.

What it is: CVE-2015-5194 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jul 2017. 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-2015-5194 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2015-5194/ (Markdown: https://insights.sbomify.com/CVE-2015-5194/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-5194
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-5194
- OSV: https://osv.dev/vulnerability/CVE-2015-5194

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-5194/
Summaries are generated and may contain mistakes; the official description above is the record.