CVE-2021-21296— Denial-of-service in Fleet
Quick assessment
Affected
fleetdm fleet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Fleet是一套主机监控平台。 Fleet中存在安全漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-21296
Vulnerability Information
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Vulnerability Title
Denial-of-service in Fleet
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是一套主机监控平台。 Fleet中存在安全漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-21296
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2021-21296 (1)
Vendor Advisories for CVE-2021-21296 (1)
-
https://github.com/fleetdm/fleet/security/advisories/GHSA-xwh8-9p3f-3x45 x_refsource_CONFIRM
Other References for CVE-2021-21296 (1)
-
https://www.npmjs.com/package/fleetctl x_refsource_MISC
IV. Related Vulnerabilities
Same product: fleet
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CVE-2026-101045
Fleet Homebrew Cask OS Command Injection via Metadata
Same vendor: fleetdm
-
CVE-2026-103265
Fleet before 4.89.0 Information Disclosure via MDM Command R -
CVE-2026-103264
Fleet before 4.87.0 Authentication Bypass via Device Identif -
CVE-2026-101047
Fleet before 4.87.0 Unauthenticated iOS App Download via Pre -
CVE-2026-101046
Fleet before 4.89.0 SQL Injection via ORDER BY Activity Endp -
CVE-2026-101045
Fleet Homebrew Cask OS Command Injection via Metadata
Same weakness: CWE-400
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FreeRDP before 3.32.0 Unbounded Memory Retention via RDPDR P -
CVE-2026-110832
FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via DRDYNVC DA -
CVE-2026-110830
FreeRDP before 3.32.0 Denial of Service via Serial IRP_MJ_CR
V. Comments for CVE-2021-21296
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