# CVE-2015-7975: Denial of service in n/a

> An attacker can cause a denial of service by sending malformed input to the NTP daemon, crashing the application.

- **Severity:** Medium 6.2 (`CVSS:3.0/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jan 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-7975, GHSA-3x6c-8mj8-xj2q, UBUNTU-CVE-2015-7975

## What is CVE-2015-7975?

CVE-2015-7975 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 30 Jan 2017. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The nextvar function in NTP before 4.2.8p6 and 4.3.x before 4.3.90 does not properly validate the length of its input, which allows an attacker to cause a denial of service (application crash).

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2015-7975?

It affects 1 product.


Products: Ntp Ntp.

## How do I fix CVE-2015-7975?

Upgrade to a fixed version.

## Is CVE-2015-7975 being exploited?

There is no known exploitation of CVE-2015-7975 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-2015-7975 and fix it if it is affected.

What it is: CVE-2015-7975 is a medium-severity denial of service vulnerability in Ntp Ntp, published on 30 Jan 2017. 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-2015-7975 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-2015-7975/ (Markdown: https://insights.sbomify.com/CVE-2015-7975/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7975
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7975
- OSV: https://osv.dev/vulnerability/CVE-2015-7975

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7975/
Summaries are generated and may contain mistakes; the official description above is the record.