---
id: "CVE-2026-102483"
kind: "vulnerability"
aliases: ["CVE-2026-102483"]
title: "NTPsec ntpd: crafted NTS request lets remote attacker terminate the daemon"
severity: "high"
cvss: 7.5
epss: 0.00582
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "linux", "ntp", "ntpsec", "self-hosted"]
not_affected_if: ["other-ntp-implementation", "version-outside-range"]
published_at: "2026-10-21T16:17:13+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-25T03:16:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102483", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-102483", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# NTPsec ntpd: crafted NTS request lets remote attacker terminate the daemon

NTPsec ntpd versions 1.1.4 through 1.2.5 contain a reachable exit triggered by an NTS request carrying excess NTS Cookie Placeholder extension fields. A remote attacker can use this to stop the time daemon.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `ntpd --version` or `ntpq -c version` to read the installed NTPsec version.
- Check whether NTS is enabled in the NTPsec configuration (unknown if the sources do not say which setting controls it).

## Fix

- Upgrade NTPsec to a release later than `1.2.5`; the first fixed version is unknown from the sources.
- Until patched, restrict access to the NTP service at the network edge if NTS is not needed (unknown if the sources give a specific setting).

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-102483
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-102483

## From the sources

Reachable exit in NTPsec ntpd 1.1.4 through 1.2.5 allows a remote attacker to terminate the daemon via an NTS request with excess NTS Cookie Placeholder extension fields.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_