---
id: CVE-2021-21296
title: Fleet is an open source osquery manager
summary: >-
  Fleet is an open source osquery manager. In Fleet before version 3.7.0 a
  malicious actor with a valid node key can send a badly formatted request that
  causes the Fleet server to exit, resulting in denial of service. This is
  possible only…
severity: low
cvss: 2.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-400
vendor: fleetdm
product: fleet
affected:
  - fleet < 3.7.0
patched:
  - fleet 3.7.0
published: '2021-02-10'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T14:18:40.287'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-21296'
references:
  - url: >-
      https://github.com/fleetdm/fleet/commit/f68f4238e83b45b2164e4ed05df14af0f06eaf40
    label: security-advisories@github.com
  - url: 'https://github.com/fleetdm/fleet/security/advisories/GHSA-xwh8-9p3f-3x45'
    label: security-advisories@github.com
  - url: 'https://www.npmjs.com/package/fleetctl'
    label: security-advisories@github.com
  - url: >-
      https://github.com/fleetdm/fleet/commit/f68f4238e83b45b2164e4ed05df14af0f06eaf40
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/fleetdm/fleet/security/advisories/GHSA-xwh8-9p3f-3x45'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.npmjs.com/package/fleetctl'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01941
epssPercentile: 0.79437
ingestedAt: '2026-10-06T15:01:49.260Z'
---

## Overview

Fleet is an open source osquery manager. In Fleet before version 3.7.0 a malicious actor with a valid node key can send a badly formatted request that causes the Fleet server to exit, resulting in denial of service. This is possible only while a live query is currently ongoing. We believe the impact of this vulnerability to be low given the requirement that the actor has a valid node key. There is no information disclosure, privilege escalation, or code execution. The issue is fixed in Fleet 3.7.0.

## Affected

- `fleet < 3.7.0`

## Remediation

Upgrade past the affected range:

- `fleet 3.7.0`