# CVE-2018-7184: Denial of service in n/a

> Remote attackers can cause a denial of service in the NTP daemon by sending packets with zero-origin timestamps, disrupting time synchronization.

- **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:** 6 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-7184, GHSA-rf4v-73h8-p6f7, UBUNTU-CVE-2018-7184

## What is CVE-2018-7184?

CVE-2018-7184 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 6 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

## Which versions are affected by CVE-2018-7184?

It affects 10 products.


Products: Canonical Ubuntu Linux, Netapp Cloud Backup, Netapp Steelstore Cloud Integrated Storage, Ntp Ntp, Slackware Slackware Linux, Synology Diskstation Manager, Synology Router Manager, Synology Skynas, Synology Virtual Diskstation Manager, Synology Vs960hd Firmware.

## How do I fix CVE-2018-7184?

Upgrade to a fixed version.

## Is CVE-2018-7184 being exploited?

There is no known exploitation of CVE-2018-7184 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-2018-7184 and fix it if it is affected.

What it is: CVE-2018-7184 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 6 Mar 2018. 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-2018-7184 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-2018-7184/ (Markdown: https://insights.sbomify.com/CVE-2018-7184/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7184
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7184
- OSV: https://osv.dev/vulnerability/CVE-2018-7184

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-7184/
Summaries are generated and may contain mistakes; the official description above is the record.