CVE-2021-21532Network attack vector

Device reconfiguration via management-server redirection

Published Apr 2, 2021 · Updated Sep 16, 2024

Improper management-server validation in Dell Wyse ThinOS before 8.6 MR9 allows remote attackers to alter device configuration. The client accepts an attacker-directed management server without adequate validation and applies its configuration or certificate file. No authentication or user interaction is required, but Dell rates exploitation as high complexity and does not disclose the redirection trigger.

CVSS severity5.6
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper management-server validation in Dell Wyse ThinOS before 8.6 MR9 allows remote attackers to alter device configuration. The client accepts an attacker-directed management server without adequate validation and applies its configuration or certificate file. No authentication or user interaction is required, but Dell rates exploitation as high complexity and does not disclose the redirection trigger.

The record

CVE
CVE-2021-21532
Published
Apr 2, 2021
Updated
Sep 16, 2024
Vendor
Dell
Product
Wyse ThinOS
Classifications
CWE-20, CWE-16, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <ThinOS 8.6 MR9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dell · Wyse ThinOSversion=unspecified <ThinOS 8.6 MR9

Published CVSS scores

5.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:P
5.6DellCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
6.3NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-16Configuration
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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