CVE-2021-21536

Sensitive information disclosure via unauthorized server registration

Published Apr 30, 2021 · Updated Sep 17, 2024

Information exposure in Dell Hybrid Client before 1.5 allows local users to register the client to a server and view sensitive information. Dell has not disclosed the component or validation failure that allows local client-to-server registration. Local access without authentication is sufficient, and the published consequence is limited to viewing unspecified sensitive information through the resulting server connection.

CVSS severity6.2
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Dell Hybrid Client before 1.5 allows local users to register the client to a server and view sensitive information. Dell has not disclosed the component or validation failure that allows local client-to-server registration. Local access without authentication is sufficient, and the published consequence is limited to viewing unspecified sensitive information through the resulting server connection.

The record

CVE
CVE-2021-21536
Published
Apr 30, 2021
Updated
Sep 17, 2024
Vendor
Dell
Product
Dell Hybrid Client
Classifications
CWE-200
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 <1.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Dell · Dell Hybrid Clientversion=unspecified <1.5

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.2DellCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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