# CVE-2016-1548: Other in NTP

> Attackers can spoof NTP packets to force clients into a broken state, rejecting valid time updates and allowing time manipulation.

- **Severity:** High 7.2 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Jan 2017
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-1548, GHSA-fp4r-m88r-wmm8, UBUNTU-CVE-2016-1548

## What is CVE-2016-1548?

CVE-2016-1548 is a high-severity vulnerability in Ntp Ntp, published on 6 Jan 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

Weakness: CWE-19

## Which versions are affected by CVE-2016-1548?

It affects 1 product.


Products: Ntp Ntp.

## How do I fix CVE-2016-1548?

Upgrade to a fixed version.

## Is CVE-2016-1548 being exploited?

There is no known exploitation of CVE-2016-1548 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-2016-1548 and fix it if it is affected.

What it is: CVE-2016-1548 is a high-severity vulnerability in Ntp Ntp, published on 6 Jan 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-2016-1548 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-2016-1548/ (Markdown: https://insights.sbomify.com/CVE-2016-1548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1548
- OSV: https://osv.dev/vulnerability/CVE-2016-1548

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-1548/
Summaries are generated and may contain mistakes; the official description above is the record.