CVE-2021-21505

Root access via undocumented default iDRAC account

Published May 6, 2021 · Updated Sep 17, 2024

An undocumented iDRAC account in Dell Integrated System for Microsoft Azure Stack Hub 1906 through 2011 grants remote attackers root access. The integrated system leaves a default iDRAC account enabled but undocumented and accepts its default credentials for an administrative login. The attacker must reach the adjacent-network management interface and know the default credentials; successful login provides root privileges.

CVSS severity8.0
High
EPSS probability2.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An undocumented iDRAC account in Dell Integrated System for Microsoft Azure Stack Hub 1906 through 2011 grants remote attackers root access. The integrated system leaves a default iDRAC account enabled but undocumented and accepts its default credentials for an administrative login. The attacker must reach the adjacent-network management interface and know the default credentials; successful login provides root privileges.

The record

CVE
CVE-2021-21505
Published
May 6, 2021
Updated
Sep 17, 2024
Vendor
Dell
Product
Integrated System for Microsoft Azure Stack Hub
Classifications
CWE-255, T1078.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 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 <2102

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Dell · Integrated System for Microsoft Azure Stack Hubversion=unspecified <2102

Published CVSS scores

8.0DellCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

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

Weakness, pattern, technique

CWE-255Credentials Management Errors
T1078.001Default Accounts

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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